Mathematics
Calculate the mean of the distribution, given below, using the short cut method :
| Marks | No. of students |
|---|---|
| 11 - 20 | 2 |
| 21 - 30 | 6 |
| 31 - 40 | 10 |
| 41 - 50 | 12 |
| 51 - 60 | 9 |
| 61 - 70 | 7 |
| 71 - 80 | 4 |
Related Questions
If the mean of the following observations is 54, find the value of p.
Class Frequency 0 - 20 7 20 - 40 p 40 - 60 10 60 - 80 9 80 - 100 13 The mean of the following distribution is 62.8 and the sum of all the frequencies is 50. Find the missing frequencies f1 and f2.
Class Frequency 0 - 20 5 20 - 40 f1 40 - 60 10 60 - 80 f2 80 - 100 7 100 - 120 8 The median of 18, 29, 15, 14 and 21 is :
15
18
29
21
The median of 3, 8, 11, 2, 16, 4, 0 and 6 is :
6
9
5
8