Statistics · Practice

Mean — Exercises

Graded practice problems from foundations to advanced. Enter your answer and press Check.

Foundations

Problem 1

Find the mean of the data set: $2, 4, 6, 8$ .

Problem 2

Find the mean of: $3, 5, 7, 9, 11$ .

Problem 3

Five numbers have a sum of $50$ . What is their mean?

Problem 4

A data set of 5 values has mean $5$ . A value of $11$ is added. Find the new mean.

Problem 5

Two groups score $60$ (weight $1$ ) and $75$ (weight $2$ ). Find the weighted mean.

Problem 6

Find the mean of: $1, 3, 5, 7, 9$ .

Problem 7

Five values have mean $8$ . Four of them are $6, 7, 8, 11$ . Find the missing value.

Problem 8

For the data $2, 4, 6$ , find the mean.

Problem 9

Group 1 ( $n=10$ , $\bar{x}=70$ ) and Group 2 ( $n=10$ , $\bar{x}=78$ ). Find the combined mean.

Problem 10

For any data set, what is $\sum (x_i - \bar{x})$ ?

Problem 11

Find the mean of the integers $1, 2, 3, \ldots, 10$ .