1. A pollster randomly selected 4 of 13 available people.

How many different groups of four are possible?

A number of possible groups?

2.A company is creating three new divisions and six managers are eligible to be appointed head of a division.

How many different ways could the three new heads be appointed?

Number of different ways?

3.The annual report of Dennis Industries cited these primary earnings per common share for the past 5 years:

$3.57, $3.21, $3.62, $2.81, and $1.67.

a.What is the arithmetic mean primary earnings per share of common stock?(Round the final answer to 2 decimal places.)

Arithmetic mean$

b.What is the variance?(Round the final answer to 2 decimal places.)

Variance

4.Consider these five values of a population: 3, 5, 6, 5, and 4.

a.Determine the mean of the population.(Round the final answer to 1 decimal place.)

Arithmetic mean

b.Determine the variance of the population.(Round the final answer to 1 decimal place.)

Variance