Question

Question 14 | -- /5 ) 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 Find the probability of selecting 9 or more girls. 0 0.212 < 0.122 (3) 0.001 @ 0.061 Question 15 -- / 5 Find the mean, u, for the binomial distribution which has the stated values of n and p. Round answer to the nearest tenth. n = 38; p = 0.2 (1) u = 8.3 u = 7.1 (3) u = 7.6

Answer 1

From the given information,

Question 14.

Here,

n=14

p=0.5

Hence,

Using binomial probability calculater,

The required probability is,

P(X≥9)=0.212

i.e., first option is correct.

Question 15.

Here,

n=38

p=0.2

Hence,

Mean=n*p=38*0.2

Mean=7.6

i.e., option 3 is correct.

Thank you.