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anonymous

  • one year ago

WILL GIVE MEDAL IF YOU TEACH ME HOW A charity is selling raffle tickets at $10 apiece. Ten third-place winners will be drawn, each winning $20. Five second-place winners will be drawn, each winning $50. Finally, one grand prize of $200 will be awarded. If 100 tickets are sold, what is the expected value of one ticket?

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  1. misty1212
    • one year ago
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    HI!!

  2. anonymous
    • one year ago
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    Hello!

  3. misty1212
    • one year ago
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    there is an easy way to do this, and a probability way lets do it the easy way first

  4. anonymous
    • one year ago
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    Alright. I'd also like to know how to do it the probability way. I have a whole test on these types of questions

  5. misty1212
    • one year ago
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    ok we can do it both ways, they are actually the same, just look different

  6. anonymous
    • one year ago
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    alright

  7. misty1212
    • one year ago
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    first buy up all 100 tickets at $10 each how much do you spend total?

  8. anonymous
    • one year ago
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    $1000

  9. misty1212
    • one year ago
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    right and since you bought all the tickets, you win all the money how much do you win total? (take your time on this one)

  10. anonymous
    • one year ago
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    $650

  11. misty1212
    • one year ago
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    looks right

  12. misty1212
    • one year ago
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    ok so you spent $1000, got back $650 how much did you lose?

  13. anonymous
    • one year ago
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    $350

  14. anonymous
    • one year ago
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    (three fiddy)

  15. misty1212
    • one year ago
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    exactly now averaged over the (lol)

  16. misty1212
    • one year ago
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    now averaged over the 100 tickets you bough you lost \[\frac{350}{100}=3.50\] expected value is \(-\$3.50\)

  17. anonymous
    • one year ago
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    ah alright. that makes a lot of sense. it just wasnt explained very well.

  18. anonymous
    • one year ago
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    Thank you!

  19. misty1212
    • one year ago
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    would you like to do it the probability way?

  20. anonymous
    • one year ago
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    wait a second

  21. misty1212
    • one year ago
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    you can see that it is the same, just looks different

  22. anonymous
    • one year ago
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    the multiple choice answers are: A. –$10.00 B. $6.50 C. $10.00 D. $216.67

  23. anonymous
    • one year ago
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    i'll check my adding again

  24. misty1212
    • one year ago
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    really??

  25. misty1212
    • one year ago
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    no i checked it is right

  26. anonymous
    • one year ago
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    hmmm. I'm not sure. what you said seems to make sense to me

  27. misty1212
    • one year ago
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    i guarantee you what i said is correct

  28. misty1212
    • one year ago
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    maybe they are not counting the amount you lose

  29. anonymous
    • one year ago
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    thats what im thinking

  30. anonymous
    • one year ago
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    that would be B, right?

  31. anonymous
    • one year ago
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    if they're not counting the amount lost

  32. misty1212
    • one year ago
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    and saying that the expected value is \(\$6.50\) which means if you spent \($10\) you lose \(\$3.50\) but that is not a true expected value

  33. misty1212
    • one year ago
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    the expected value is the amount you win times the probability you win it, added up, but you should also include the amount you lose as a negative

  34. anonymous
    • one year ago
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    I know. that seems weird to me

  35. anonymous
    • one year ago
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    yours makes more sense realistically

  36. misty1212
    • one year ago
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    because it is wrong you would "expect" the expected value of a lottery ticket to be negative, otherwise the charity would not make any money

  37. anonymous
    • one year ago
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    exactly

  38. misty1212
    • one year ago
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    -3.50 to you , +3.50 per ticket to them tell your teacher!

  39. anonymous
    • one year ago
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    I would if i had a teacher right now. Im on the last test of my online geometry course and they didnt explain it very well at all. maybe because they have no idea what they're talking about lol

  40. misty1212
    • one year ago
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    if this is geometry i am an old man

  41. anonymous
    • one year ago
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    well i can hope that 6.50 is probably the right answer

  42. misty1212
    • one year ago
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    yeah it is the only one of the bunch that makes sense, go with that one

  43. anonymous
    • one year ago
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    I know. I was thinking the same thing

  44. anonymous
    • one year ago
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    welcome to South Dakota state standards

  45. anonymous
    • one year ago
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    well thanks for the help!

  46. anonymous
    • one year ago
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    if you have the time could i get help with one more? it seems to be a little different. if not thats okay

  47. misty1212
    • one year ago
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    sure

  48. anonymous
    • one year ago
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    In a certain board game, a standard number cube is rolled to determine the number of spaces a player gets to move. Use the table above to determine the expected value of the number of spaces a player moves. Round the answer to the nearest tenth.

  49. misty1212
    • one year ago
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    unless it is really geometry, because i am clueless about that

  50. anonymous
    • one year ago
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    posting the table in just a sec

  51. misty1212
    • one year ago
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    one "number cube" aka one die?

  52. anonymous
    • one year ago
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  53. anonymous
    • one year ago
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    yep! lol

  54. anonymous
    • one year ago
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    this online course was so poorly designed its not even funny

  55. misty1212
    • one year ago
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    each outcome has probability \(\frac{1}{6}\) so really all you have do to is add and divide by 6

  56. misty1212
    • one year ago
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    \[\huge \frac{6+3+3-3-3+1}{6}\]

  57. misty1212
    • one year ago
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    aka \[\frac{7}{6}\] and please don't tell me that is not an answer choice !!

  58. anonymous
    • one year ago
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    I got 1.16666.... which rounds to 1.2

  59. anonymous
    • one year ago
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    which is an answer!

  60. misty1212
    • one year ago
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    ok i they love decimals pick that one who writes this gibberish?

  61. anonymous
    • one year ago
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    No clue. A lot of the time they have trouble formulating a sentence. Sometimes major grammatical errors. It's a pain in the rear

  62. misty1212
    • one year ago
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    FLVS or some other criminal enterprise?

  63. anonymous
    • one year ago
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    Edgenuity, aka education2020, surprisingly

  64. anonymous
    • one year ago
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    There were so many cases where they'd say something like an angle measuring 135º or something, and then the picture of it looking like a 45º angle

  65. anonymous
    • one year ago
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    Obviously looking acute but they swear it measures over 90º

  66. misty1212
    • one year ago
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    imagine remember that these questions are written mostly by middle school math teachers or (mainly) starving graduate students living on ramen noodles and beer. they are rarely checked for accuracy

  67. anonymous
    • one year ago
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    Probably. I've had to retake tests before simply because the right answer just wasn't in the answer choices. I had to get an actual teacher from my highschool to verify that I was right and the grading system was wrong.

  68. misty1212
    • one year ago
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    nothing like an "actual teacher" lol

  69. anonymous
    • one year ago
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    Sorta. She prefers "Librarian"

  70. misty1212
    • one year ago
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    you got more or is that it?

  71. misty1212
    • one year ago
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    LOLOLOL!!!

  72. anonymous
    • one year ago
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    well there is another but I think I got it

  73. misty1212
    • one year ago
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    ok good luck !

  74. anonymous
    • one year ago
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    this is getting ridiculous

  75. anonymous
    • one year ago
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    im just done

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