The mean of the following distribution is 26

MATHEMATICS · Single correct · A Level · Mathematics · Data presentation and interpretation · Data presentation and interpretation

Problem

The mean of the following distribution is 26. Find the population variance (correct to the nearest whole number). Class interval (units): 10–20 | 20–30 | 30–40 Frequency: 7 |

x

| 9 (a) 83 (b) 79 (c) 80 (d) 104

Related theory

Measures of Center
Variance and Standard Deviation
Measures of Spread
Statistics

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