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Function: require_once

A local inn asked customers to rate their stays on a scale of 1-10. The following list shows the ratings given by the last 10 customers.

10 1 4 2 6 3 6 3 10 5

a) Calculate the range. 

b) Calculate the variance. 

c) Calculate the standard deviation.

The range of any data is maximum - minimum, 

in the case of the above data the maximum is 10 and the minimum is 1. Therefore, the range is 10 - 1 = 9. 

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