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anonymous

  • one year ago

Please help? A gambler has developed a weighted six-sided die with sides marked 1, 2, 3, 4, 5, 6. The probability of rolling a 6 is 0.4 and all other sides are equally likely. (X is a random variable). What is the probability that an even number is rolled?

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  1. javalos01
    • one year ago
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    hello

  2. javalos01
    • one year ago
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    do you need help

  3. anonymous
    • one year ago
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    Yes, please

  4. anonymous
    • one year ago
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    I do not understand how to find this probability

  5. javalos01
    • one year ago
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    well do you know probabilities

  6. anonymous
    • one year ago
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    Yes I do, but what I am confused about is that he gave us an assigned probability. Usually the probability for rolling a dice is 1/6, but he made it .4 and that confuses me.

  7. javalos01
    • one year ago
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    ok so you know that the probablilty of rolling two is 1/6 right

  8. javalos01
    • one year ago
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    or am i wrong

  9. anonymous
    • one year ago
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    Yes, that is correct

  10. javalos01
    • one year ago
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    well it is confusing but what is your best guess

  11. javalos01
    • one year ago
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    we know all of them have a probibility of 1/6 so what u do with the 0.4 is divide or multiply

  12. anonymous
    • one year ago
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    Multiply?

  13. javalos01
    • one year ago
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    yes correct

  14. javalos01
    • one year ago
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    and the equation is

  15. javalos01
    • one year ago
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    0.4 *6 correct

  16. anonymous
    • one year ago
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    I thought you said multiply. So wouldn't it be 0.4 x 1/6?

  17. javalos01
    • one year ago
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    the * is the multivly sign

  18. javalos01
    • one year ago
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    and the / is division

  19. javalos01
    • one year ago
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    so after you multiply

  20. javalos01
    • one year ago
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    u get ??

  21. anonymous
    • one year ago
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    2.4?

  22. javalos01
    • one year ago
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    correct

  23. javalos01
    • one year ago
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    and thats your answer 2.4 you get it

  24. anonymous
    • one year ago
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    Where did the 6 come from though? I thought we were using 1/6. So wouldn't 0.4 x (1/6)= .0667?

  25. javalos01
    • one year ago
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    ik

  26. javalos01
    • one year ago
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    but we have to multiply th ewhole number and then

  27. anonymous
    • one year ago
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    I thought probability was supposed to be between 0 and 1

  28. javalos01
    • one year ago
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    @Rushwr

  29. javalos01
    • one year ago
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    no its one through 6

  30. javalos01
    • one year ago
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    so if yyou peice it all together 0.4x6=2.4 And that peices it all together

  31. javalos01
    • one year ago
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    u get it

  32. javalos01
    • one year ago
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    maybe you can help him understand rushwer

  33. Rushwr
    • one year ago
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    Soo basically what u have to know is when u add all the probabilities they should be equal to 1

  34. javalos01
    • one year ago
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    yes they do 1/6+1/6 ect.

  35. javalos01
    • one year ago
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    and youll get 1 once you add them all and thank you so much rushwer for your help

  36. javalos01
    • one year ago
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    i really appreciate it

  37. Rushwr
    • one year ago
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    P1 = probability of rolling 1 P2 = probability of rolling 2 P3 = probability of rolling 3 P4= probability of rolling 4 P5= probability of rolling 5 P6 = Probability of rolling 6 P1+P2+P3+P4+P5+P6 = 1

  38. javalos01
    • one year ago
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    yea thats what i meant too thats what i was trying to help him get in my equation

  39. Rushwr
    • one year ago
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    Except for P6 others are same right? so we can say P1=P2=P3=P4=P5 so instead of P1+P2+P3+P4+P5 we can right 5P1 right?

  40. javalos01
    • one year ago
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    yea

  41. javalos01
    • one year ago
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    So do you get it now

  42. javalos01
    • one year ago
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    @tennis96

  43. Rushwr
    • one year ago
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    so 5P1 + P6 = 1 We know P6 = 0.4 So 5P1 = 1-0.4 = 0.6 So P1 = 0.6/5 = 0.12 Except for the probability of rolling 6 other probabilities are 0.12

  44. javalos01
    • one year ago
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    yea correct

  45. anonymous
    • one year ago
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    But it says all other sides are equally likely. So that means the probability of rolling a 6 is 0.4. And the probability or rolling either a 1,2,3,4, or 5 is 0.4 as well?

  46. Rushwr
    • one year ago
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    That is ; P1= 0.12 P2 = 0.12 P3 =0.12 P4 = 0.12 P5 = 0.12 P6 = 0.4 Now add up the probabilities of the even numbers ! That is P2+P4+P6 Then u get the probability of rolling an even number

  47. javalos01
    • one year ago
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    yea do you get it now tennis

  48. anonymous
    • one year ago
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    OHH it just clicked

  49. anonymous
    • one year ago
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    So all the other trials would have to be equal to 0.6 right? so 0.6/ 5= .12

  50. javalos01
    • one year ago
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    yes thank you so much for letting us help you

  51. javalos01
    • one year ago
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    i have a great time personaly helping students find there way

  52. anonymous
    • one year ago
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    Thank you!

  53. javalos01
    • one year ago
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    your wekcome thank you or letting us help you

  54. Rushwr
    • one year ago
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    "The probability of rolling a 6 is 0.4 and all other sides are equally likely" this what the question said. I think u took it wrong !!! This means probability of rolling 6 is 0.4 and all the others equal. But this doesn't mean all the other sides are equal to 0.4 . Simply it says the probability of rolling 6 is different than the others

  55. anonymous
    • one year ago
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    Yeah I did haha! thanks for pointing this out to me Rusher!

  56. Rushwr
    • one year ago
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    Rushwr* lol no problem !!!!

  57. javalos01
    • one year ago
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    can i have a medal plzz

  58. javalos01
    • one year ago
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    i helped too lol

  59. javalos01
    • one year ago
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    im just kidding i dont care about medals i just care about helping other students

  60. Rushwr
    • one year ago
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    okai Done ! I gave u a medal !!!!!

  61. javalos01
    • one year ago
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    thnx

  62. Rushwr
    • one year ago
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    I hope u got the answer right 11 @tennis96 Can I know ur answer before I leave this ?

  63. Rushwr
    • one year ago
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    No problem :)

  64. javalos01
    • one year ago
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    yea thats what i asked too

  65. anonymous
    • one year ago
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    I'm guessing I add all the probabilities together. P(2)= .12 P(4)=.12 P(6)= .4. Added together is this ..

  66. anonymous
    • one year ago
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    .64?

  67. Rushwr
    • one year ago
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    Correct !!!!

  68. anonymous
    • one year ago
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    Okay perfect thank you :)

  69. javalos01
    • one year ago
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    yes you are correct

  70. Rushwr
    • one year ago
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    Anytym :)

  71. javalos01
    • one year ago
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    thank you for everything

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