The following frequency distribution represents the number of hours studied per week by a sample of...
The following frequency distribution represents the number of hours studied per week by a sample of 50 students. Picture Refer to Exhibit 3-8. The standard deviation of the number of hours studied is: 1.89. 2.79. 3.50. 3.56.
| hours studied | midpoint | frequency |
| 2.5 less than 5.5 | 4 | 5 |
| 5.5 less than 8.5 | 7 | 30 |
| 8.5 less than 11.5 | 10 | 25 |
Homework Answers
| Midpoint (M) | Frequency (f) | M * f |  |
|---|---|---|---|
| 4 | 5 | 20 | 80 |
| 7 | 30 | 210 | 1470 |
| 10 | 25 | 250 | 2500 |
 |
 |
 |
The standard deviation of the number of hours studied is,
=> standard deviation = 1.89
Answer : 1.89
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