Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Help ...probabilty/??

Help ...probabilty/??

1.find the probability of getting a total score of 4 when john throws two fair dice together.

If the die are thrown 100 times, estimate the expected number of times john will get a score of 4

2. A dice is made so that the probability of getting a 6 is 3/10, and the probability of getting a 5 is 2/10. The probabilites of gettin any other number are all equal. If the dice is thrown twice, find the probability

i) you get 2 sixes

ii)you get no sixes

iii)the sum of 2 numbers is 6

Please show working out, these were two of 15 questions I couldnt do.

Thanks

2 Answers

Relevance
  • Jacob
    Lv 5
    1 decade ago
    Favorite Answer

    Probability of getting total 4

    2 and 2 chance= 1/6 x 1/6

    =1/36

    Or 3 and 1 being thrown

    = 1/6 x 1/6

    = 1/36

    Chance of either happening is 1/36 + 1/36 = 1/18

    So chance of getting a total score of 4 = 1/18

    100/18 = 5.5 round up to 6

    100 throws = 6 scores of 4 (i think)

    2.

    i. 2 sixes = 3/10 x 3/10 = 9/100

    ii. no sixes = 7/10 x 7/10 = 49/100

    iii. sum of 2 throws is 6

    1/10 x 1/10 for getting two 3s (1/100

    (1/10 x 1/10)x2 for getting 4 & 2 (1/50)

    (2/10 x 1/10)x2 for getting 5 & 1 (1/25)

    Add all the above = 7/100

  • 1 decade ago

    the answer to the first one is 1 in 12 because the chances of the first die being 1, 2 or 3 is 1 in 6 and then the chances of the second one being 1, 2 or 3 is also 1 in 6 so put them together to make 1 in 12, but don't put 2 in 12 because that is wrong. sorry i cant answer the rest i have to go

Still have questions? Get your answers by asking now.