Question

What are the values of the mean, median, and spread for the dataset shown in the bar graph?

10 = 2
11 = 4
12 = 4
13 = 2

Answer 1

Find the spread

Answer 2

Mean = (10*2 + 11*4 + 12*4 + 13*2) / (2 + 4 + 4 + 2) = 11.7

Median = 11 (middle value when arranged in ascending order)

Spread:
Range = 13 - 10 = 3
Interquartile Range (IQR) = Q3 - Q1 = 12 - 11 = 1

Answer 3

To find the spread, we can calculate the range of the dataset.

Range = Maximum value - Minimum value
Range = 13 - 10
Range = 3

Therefore, the spread of the dataset is 3.