Question

The state test scores for 12 randomly selected high school seniors are shown :

Complete parts (a) through (c) below.

Assume the population is normally distributed.

1423 1229 987
692 726 833
724 742 541
628 1444 946

(a) Find the sample mean.

Answer 1

To find the sample mean, sum up all the given test scores and divide by the total number of scores.

Step-by-step explanation:

To find the sample mean, you need to sum up all the given test scores and divide by the total number of scores. Using the given data of test scores:

1423 + 1229 + 987 + 692 + 726 + 833 + 724 + 742 + 541 + 628 + 1444 + 946 = 11,874

Then divide the sum by the number of test scores, which is 12:

11,874 / 12 = 989.5

Therefore, the sample mean is 989.5.