standard deviation question (EASY)

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
Statistics
Le Mon Le Mon
32
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Erniemist Erniemist
38
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