$standard deviation question (EASY)$

Question

The table below shows the number of days lost due to sickness during one week of operation on a chemical plant;

calculate the standard deviation relating to the number of days lost using the data in the table;

Days Lost	1-7	8-14	15-21	22-28	29-35
Frequency	13	21	26	28	25

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std = 83.4715326181

Standard Deviation is calculated as the average square of the difference of each value from the mean. In this case there are 113 values. The value of each of those is the average of the days lost in its category, so there are 13 values with 4 days lost, on average. The mean of the values is 19.920354 and the mean of the squares of the differences is 83.47.

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$standard deviation question (EASY)$

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