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Mean and the standard deviation for frequency distribution

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Determine the mean and the standard deviation of the following frequency distribution.

Class Frequency
0 up to 5 2

5 up to 10 7

10 up to 15 12

15 up to 20 6

20 up to 25 3

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Solution Summary

The solution shows how to calculate the mean and standard deviation for a discrete frequency distribution of data given..

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Hello!
In order to solve this, you have to use the midpoints of the histogram classes. For example, we're told that there are 7 observations from 5 up to 10. Using the midpoint, we'll assume that there were 7 observations of 7.5, which is the midpoint between 5 and 10.

So we get the frequency table:
Midpoint ...

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