Mathematics
The ages of 40 students are given in the following table :
| Age (in years) | Frequency |
|---|---|
| 12 | 2 |
| 13 | 4 |
| 14 | 6 |
| 15 | 9 |
| 16 | 8 |
| 17 | 7 |
| 18 | 4 |
Find the arithmetic mean.
Measures of Central Tendency
22 Likes
Answer
| Age (x) | Frequency (f) | fx |
|---|---|---|
| 12 | 2 | 24 |
| 13 | 4 | 52 |
| 14 | 6 | 84 |
| 15 | 9 | 135 |
| 16 | 8 | 128 |
| 17 | 7 | 119 |
| 18 | 4 | 72 |
| Total | Σf = 40 | Σfx = 614 |
We know that,
n = Σf = 40.
By formula,
Mean = = 15.35
Hence, arithmetic mean = 15.35
Answered By
11 Likes
Related Questions
If the mean of 6, 4, 7, a and 10 is 8, find the value of 'a'.
The mean of the number 6, y, 7, x and 14 is 8. Express y in terms of x.
If 69.5 is the mean of 72, 70, x, 62, 50, 71, 90, 64, 58 and 82 : find the value of x.
The following table gives the heights of plants in centimeter. If the mean height of plants is 60.95 cm; find the value of 'f'.
Height (cm) No. of plants 50 2 55 4 58 10 60 f 65 5 70 4 71 3