Question

Assume that a researcher randomly selects 14 newborn babies and count the number of girls, X. The probabilities corresponding to the 14 possible values of X are summarized in the given table. Answer the questions using the table. Find the probability of selecting exactly 3 girls.
A. 0.022
B. 0.122
C. 0.001
D. 0.061

Answer 1

No idea what "tables" you are talking about, don't need any

prob(girl) = 1/2
prob(not a girl) = 1-1/2 =1/2

prob(exactly 3 girls in 14)
= C(14,3) (1/2)^3 (1/2)^11
= 364(1/2)^14 = appr. .0222