Mathematics
Find mean by 'step-deviation method' :
| C.I. | Frequency |
|---|---|
| 63 - 70 | 9 |
| 70 - 77 | 13 |
| 77 - 84 | 27 |
| 84 - 91 | 38 |
| 91 - 98 | 32 |
| 98 - 105 | 16 |
| 105 - 112 | 15 |
Related Questions
The following table gives the ages of 50 students of a class. Find the arithmetic mean of their ages.
Age (years) No. of students 16 - 18 2 18 - 20 7 20 - 22 21 22 - 24 17 24 - 26 3 The following are the marks obtained by 70 boys in a class test.
Marks No. of boys 30 - 40 10 40 - 50 12 50 - 60 14 60 - 70 12 70 - 80 9 80 - 90 7 90 - 100 6 Calculate the mean by :
(i) Short-cut method
(ii) Step-deviation method
Using the information given in the adjoining histogram; calculate the mean.
