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Probability

Question
CBSEENMA12033800
Wired Faculty App

Find the probability distribution of the number of times “a total of 9” appears in two draws of two dice.

Solution
Let X denote the number of times ‘a total of 9’ appears. X takes the values 0, 1, 2. Let p denote the probability of getting ‘a total of 9’ and q denote the probability of not getting ‘a total of 9’.
        therefore space space space space space space space space straight p space equals space straight P thin space left curly bracket left parenthesis 3 comma space 6 right parenthesis comma space left parenthesis 4 comma space 5 right parenthesis comma space left parenthesis 5 comma space 4 right parenthesis comma space left parenthesis 6 comma space 3 right parenthesis right curly bracket space equals space 4 over 36 space equals 1 over 9
                  straight q space equals space 1 minus straight p space equals space 1 minus 1 over 9 space equals space 8 over 9
   straight P left parenthesis straight X space equals space 0 right parenthesis space equals space straight q space straight q space equals space 8 over 9 cross times 8 over 9 space equals 64 over 81 straight P left parenthesis straight X space equals space 1 right parenthesis space equals space straight p space straight q space plus space straight q space straight p space equals space 1 over 9 cross times 8 over 9 plus 8 over 9 cross times 1 over 9 space equals 8 over 81 plus 8 over 81 space equals 16 over 81 straight P left parenthesis straight X space equals space 2 right parenthesis space equals space straight p space straight p space equals space 1 over 9 cross times 1 over 9 space equals space 1 over 81
∴ probabilities distribution is

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