anonymous
  • anonymous
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?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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misty1212
  • misty1212
HI!!
anonymous
  • anonymous
Hello!
misty1212
  • misty1212
there is an easy way to do this, and a probability way lets do it the easy way first

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More answers

anonymous
  • anonymous
Alright. I'd also like to know how to do it the probability way. I have a whole test on these types of questions
misty1212
  • misty1212
ok we can do it both ways, they are actually the same, just look different
anonymous
  • anonymous
alright
misty1212
  • misty1212
first buy up all 100 tickets at $10 each how much do you spend total?
anonymous
  • anonymous
$1000
misty1212
  • misty1212
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)
anonymous
  • anonymous
$650
misty1212
  • misty1212
looks right
misty1212
  • misty1212
ok so you spent $1000, got back $650 how much did you lose?
anonymous
  • anonymous
$350
anonymous
  • anonymous
(three fiddy)
misty1212
  • misty1212
exactly now averaged over the (lol)
misty1212
  • misty1212
now averaged over the 100 tickets you bough you lost \[\frac{350}{100}=3.50\] expected value is \(-\$3.50\)
anonymous
  • anonymous
ah alright. that makes a lot of sense. it just wasnt explained very well.
anonymous
  • anonymous
Thank you!
misty1212
  • misty1212
would you like to do it the probability way?
anonymous
  • anonymous
wait a second
misty1212
  • misty1212
you can see that it is the same, just looks different
anonymous
  • anonymous
the multiple choice answers are: A. –$10.00 B. $6.50 C. $10.00 D. $216.67
anonymous
  • anonymous
i'll check my adding again
misty1212
  • misty1212
really??
misty1212
  • misty1212
no i checked it is right
anonymous
  • anonymous
hmmm. I'm not sure. what you said seems to make sense to me
misty1212
  • misty1212
i guarantee you what i said is correct
misty1212
  • misty1212
maybe they are not counting the amount you lose
anonymous
  • anonymous
thats what im thinking
anonymous
  • anonymous
that would be B, right?
anonymous
  • anonymous
if they're not counting the amount lost
misty1212
  • misty1212
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
misty1212
  • misty1212
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
anonymous
  • anonymous
I know. that seems weird to me
anonymous
  • anonymous
yours makes more sense realistically
misty1212
  • misty1212
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
anonymous
  • anonymous
exactly
misty1212
  • misty1212
-3.50 to you , +3.50 per ticket to them tell your teacher!
anonymous
  • anonymous
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
misty1212
  • misty1212
if this is geometry i am an old man
anonymous
  • anonymous
well i can hope that 6.50 is probably the right answer
misty1212
  • misty1212
yeah it is the only one of the bunch that makes sense, go with that one
anonymous
  • anonymous
I know. I was thinking the same thing
anonymous
  • anonymous
welcome to South Dakota state standards
anonymous
  • anonymous
well thanks for the help!
anonymous
  • anonymous
if you have the time could i get help with one more? it seems to be a little different. if not thats okay
misty1212
  • misty1212
sure
anonymous
  • anonymous
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.
misty1212
  • misty1212
unless it is really geometry, because i am clueless about that
anonymous
  • anonymous
posting the table in just a sec
misty1212
  • misty1212
one "number cube" aka one die?
anonymous
  • anonymous
anonymous
  • anonymous
yep! lol
anonymous
  • anonymous
this online course was so poorly designed its not even funny
misty1212
  • misty1212
each outcome has probability \(\frac{1}{6}\) so really all you have do to is add and divide by 6
misty1212
  • misty1212
\[\huge \frac{6+3+3-3-3+1}{6}\]
misty1212
  • misty1212
aka \[\frac{7}{6}\] and please don't tell me that is not an answer choice !!
anonymous
  • anonymous
I got 1.16666.... which rounds to 1.2
anonymous
  • anonymous
which is an answer!
misty1212
  • misty1212
ok i they love decimals pick that one who writes this gibberish?
anonymous
  • anonymous
No clue. A lot of the time they have trouble formulating a sentence. Sometimes major grammatical errors. It's a pain in the rear
misty1212
  • misty1212
FLVS or some other criminal enterprise?
anonymous
  • anonymous
Edgenuity, aka education2020, surprisingly
anonymous
  • anonymous
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
anonymous
  • anonymous
Obviously looking acute but they swear it measures over 90º
misty1212
  • misty1212
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
anonymous
  • anonymous
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.
misty1212
  • misty1212
nothing like an "actual teacher" lol
anonymous
  • anonymous
Sorta. She prefers "Librarian"
misty1212
  • misty1212
you got more or is that it?
misty1212
  • misty1212
LOLOLOL!!!
anonymous
  • anonymous
well there is another but I think I got it
misty1212
  • misty1212
ok good luck !
anonymous
  • anonymous
this is getting ridiculous
anonymous
  • anonymous
im just done

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