Assume the student body of a large university (with over 10,000 students) is 55% female, 45% male. Fifteen students are selected randomly. Let X represent the number of females in the sample. (4 pts) Find the mean, variance, and standard deviation of X.

Mean = 8.25

Variance = 3.7125

Standard deviation = 1.927

Step-by-step explanation:

Let the probability of X be p.

Then

It follows that X is a binomial random variable.

For a binomial distribution, for n samples,

Mean,

Variance,

Standard deviation,

Using values in the question, n = 15

Mean =

Variance =

Standard deviation =

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

22.83 repeating

step-by-step explanation:

137 ÷ 6 is 22.8333333 therefore we understand that 3 is repeating.

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