Question 12 Marks
The following table shows the number of students and the time they utilized daily for their studies. Find the mean time spent by the students for their studies.
| Class Time (In hours) | Class Marks $(x_i)$ | No. of Students $(f_i)$ | $f_i x_i$ |
| 0 - 2 | 1 | 8 | 08 |
| 2 - 4 | 3 | 14 | 42 |
| 4 - 6 | 5 | 18 | 90 |
| 6 - 8 | 7 | 10 | 70 |
| 8 - 10 | 9 | 10 | 90 |
Answer
View full question & answer→Total $\sum f_i = 8 + 14 + 18 + 10 + 10 = 60$
Total $\sum f_i x_i = 08 + 42 + 90 + 70 + 90 = 300$
Mean $\bar{x} = \frac{\sum f_i x_i}{\sum f_i} = \frac{300}{60} = 5$ hours.
Total $\sum f_i x_i = 08 + 42 + 90 + 70 + 90 = 300$
Mean $\bar{x} = \frac{\sum f_i x_i}{\sum f_i} = \frac{300}{60} = 5$ hours.