Question
Assume that a researcher randomly selects 14 newborn babies and counts the number of girls selected, x. The probabilities corresponding to the 14 possible values of x are summarized in the given table. Answer the question using the table. Probabilities of Girls xigls) P) lgirls) Px) x(girls) P) 0 0.0005 0.12210 0.061 1 0.0016 0.183 11 0.022 2 0.00670.20912 0.006 3 0.022 80.183 13 0.001 4 0.061 9 0.122 140.000 20) Find the probability of selecting exactly 4 girls 21) Find the probability of selecting 12 or more girls.
Explanation / Answer
a) The Probability of selecting exactly 4 girls as per table is 0.061 or 6.1%
b) Probability of selecting 12 or more girls as per table
P(12+)= P(12) + P (13) + P(14)
P(12+)= 0.006 + 0.001+ 0.000 = 0.007
or 0.7%