Cups of Coffee

Frequency

0

700

1

900

2

600

3

300

2,500

A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information. above

The variance of the number of cups of coffee is

The expected number of cups of coffee is

Ifn= 10 andp= 0.60, then the mean of the binomial distribution is

Ifn= 20 andp= 0.70, then the standard deviation of the binomial distribution is

In a large university, 15% of the students are female. If a random sample of twenty students is selected,

a.what is the probability that the sample contains exactly four female students?b.what is the probability that the sample will contain no female students?c.what is the probability that the sample will contain exactly twenty female students?d.what is the probability that the sample will contain more than nine female students?e.what is the probability that the sample will contain fewer than five female students?f.what is the expected number of female students?

Suppose the probability of someone wearing a pair of glasses among 5th graders is 39.3%.If there are 52 kids in a class, what will be the standard deviation of this distribution?

Suppose the probability of someone wearing a pair of glasses among 5th graders is 31%.If there are 48 kids in a class, how many of them are expected to have glasses?