Question
The table below shows the total number of workers-days lost to sickness during one week's operation...
The table below shows the total number of workers-days lost to sickness during one week's operation of a small chemical plant.
|
Days Lost |
1-3 |
4-6 |
7-9 |
10-12 |
13-15 |
|
Frequency |
9 |
6 |
8 |
7 |
5 |
Calculate the mean, variance and standard deviation of the number of lost days.
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