3.2 Measure of Central Tendency and Dispersion

What is mean?

• average

• sum of data

• value that has a higher frequency

• the value located at a center of a set of data

The mean of the data set: 5, 4, 9, 10, 7 is

• 6

• 7

• 8

• 9

The mean of the following set of data: 25, 30, 10, 15, 20, 35.

• 11.5

• 12.5

• 22.5

• 32.5

Given a set of data: 9, 4, 5, 2, 8, 9, 1. What is the mode?

• 4

• 5

• 8

• 9

Answer explanation

The mode is 9 because it appears 2 times.

What is the median of a data set: 3, 10, 4, 7, 6, 2, 2, 1?

• 3

• 3.5

• 4

• 4.5

What is range?

• the difference between the largest and smallest value of the variable.

• the sum of the largest and smallest value of the variable.

Find the range of sample data: 10, 20, 15, 18, 25, 16, and 11.

• 10

• 15

• 20

• 25

Find the variance of sample data: 23, 20, 24, 21, 22.

• 0.5

• 1.5

• 2.5

• 3.5

Standard deviation is...

• the average degree to which each point differs from the mean.

• the spread of a group of numbers from the mean.

What is the mode of 7, 8, 3, 2, 8, 9, 5, 8 ?

• 3

• 5

• 7

• 8