Consider a population of five families with the following data representing the number of pets in each family.

Family	Number of Pets
L	2
M	8
N	7
O	5
P	1

(a)Determine the mean (in pets) and the variance of the population.

mean ? pets

variance. ?

(b)There are ten possible samples of size 2 (sampling without replacement). List the 10 possible samples of size 2, and determine the mean of each sample. (Enter your samples as alphabetically ordered comma-separated lists. Order your samples alphabetically by first value, then alphabetically by second value.)

Sample	Sample Mean

(c)Using the ten sample mean values, compute the mean and the standard deviation (in pets) from the mean determined. (Round your standard deviation to three decimal places.)

mean ? pets

standard deviation ? pets