Three seeds are sown. Each independently germinates with probability 0.5. If $X$ = number that germinate, then $P[X = 2]$ equals:
A$1$
B$1/2$
C$1/8$
D$3/8$
Answer & Solution
Correct answer: D. $3/8$
Binomial: $P[X=2] = \binom{3}{2}(0.5)^2(0.5)^1 = 3 \times 1/8 = 3/8$.
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