As part of advertising campaign, the Dairy Council is interested in determining the daily intake of milk among adults. A random sample of ten adults gave the following results. (Values are given in ounces.)
23

30.6

20.3

10.1

11.5

21.8

22.2

26.9

21

30.1

a. Find out 'x and s for this data set.
b. Make a 99 percent confidence interval for mean daily intake of milk. You might suppose the daily intake amounts are normally distributed. (Note: These results could then be employed in later studies to see if the ad campaign is succeeding in increasing amount of milk adults drink.)