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sunshnee8

  • 3 years ago

Find the probability P(prime sum when tossing 2 dice). Write in fraction form. Please explain. Thanks

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  1. AccessDenied
    • 3 years ago
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    It would be helpful if we knew all the possible sums of the dice. I think it is easiest to use a table with numbers 1-6 on the top row and 1-6 on the left column, and just compute all the sums. Then we can easily see all the prime sums from the table. |dw:1349635556005:dw|

  2. AccessDenied
    • 3 years ago
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    |dw:1349635743681:dw| Completed Table ^

  3. AccessDenied
    • 3 years ago
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    |dw:1349635839214:dw| So, you can see all of the prime sums on the table: The probability from there is just (# of primes)/(total entries in the table)

  4. sunshnee8
    • 3 years ago
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    I tried that and I missed a few sums. Your table makes it more clear. Thank you. very much. So it would be 15/36 reduced into 5/12 correct?

  5. AccessDenied
    • 3 years ago
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    Yes. :)

  6. sunshnee8
    • 3 years ago
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    Thank you!!!

  7. AccessDenied
    • 3 years ago
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    You're welcome!

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