# 14

The attendance at 4 cinema halls on a given day was 200, 500, 300 and 1,000 people.

1. Calculate the dispersion of the number of attendees.

2. Calculate the coefficient of variation.

3. If there were 50 attendees more in each room on the same day, what effect would it have on the dispersion?

#### Standard Deviation

#### Coefficient of Variation

#### 3

The standard deviation does not change, because the same number is added to each data series.

The relative dispersion is lower in the second case.

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