The table shows the distribution of the number of hours per day spent in studying by 50 students.
|
Number of hours per day |
4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
|
Number of students |
5 | 7 | 5 | 9 | 12 | 4 | 3 | 5 |
Calculate, correct to two decimal places,
the: (a) mean; (b) standard deviation.
Explanation
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