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The following table shows the number of working hours and the number of employees employed in a small scale industry
The average number of working hours of an employee is
The following table shows the number of working hours and the number of employees employed in a small scale industry
| No. of working hours | No. of employees |
| 3 - 5 | 7 |
| 5 - 7 | 10 |
| 7 - 9 | 18 |
| 9 - 11 | 57 |
| 11 - 13 | 14 |
| 13 - 15 | 8 |
The average number of working hours of an employee is
Answer & Solution
Correct Answer:
Option
B
We have :
Sum of working hours of all the employees
= (4 × 7 + 6 × 10 + 8 × 18 + 10 × 57 + 12 × 14 + 14 × 8)
= (28 + 60 + 144 + 570 + 168 + 112)
= 1082
Total number of employees
= (7 + 10 + 18 + 57 + 14 + 8)
= 114
∴ Average number of working hours
= $$\left( {\frac{{1082}}{{114}}} \right)$$
= 9.49 $$ \approx $$ 9.5
| Mean working hours | 4 | 6 | 8 | 10 | 12 | 14 |
| No. of employees | 7 | 10 | 18 | 57 | 14 | 8 |
Sum of working hours of all the employees
= (4 × 7 + 6 × 10 + 8 × 18 + 10 × 57 + 12 × 14 + 14 × 8)
= (28 + 60 + 144 + 570 + 168 + 112)
= 1082
Total number of employees
= (7 + 10 + 18 + 57 + 14 + 8)
= 114
∴ Average number of working hours
= $$\left( {\frac{{1082}}{{114}}} \right)$$
= 9.49 $$ \approx $$ 9.5
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