Answer
P(12) = 0.2184
Work Step by Step
Using formula $P(x) = _{n}C_{x}p^{x}(1-p)^{(n-x)}$, we have:
P(12) = $_{15}C_{12}0.85^{12}(1-0.85)^{(15-12)}$
= 455. 0.1422 . 0.0034
= 0.2184
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