Assume that a researcher randomly selects 14 newborn babies and counts the numbe

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%

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