Here are the answer to the question. Please let me know in case you've a question. .
1.
p = .55
Expected number of shorts until he misses is 1/p = 1/.55 = 1.82
Answer is 1.82
2. P(X=2) = ?
We hae been given parameters of binomial distribution. So, lets use them to solve the problem
P(X,n,p)
= P(2,15,.11)
= nCx*p^x * (1-p)^(n-x)
= 15C2 * .11^2 * .89^13
= 0.279
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