question_answer 60)

A pair of dice is thrown 4 times. If getting a doublet is considered a success, find the probability of two successes. 

Answer:

When a die is tossed, then the doublets are [(1, 1), (2, 3), (3, 3), (4, 4), (5, 5), (6, 6)}                   Let x be the number of successes, then x has the binomial distribution with n = 4, p =       P(x = r) = nCr qn-rpr       (two successes) = P(x = 2)