Mathematics
Using step deviation method, calculate the mean of the following frequency distribution :
| Class-interval | Frequency |
|---|---|
| 50 – 60 | 9 |
| 60 – 70 | 11 |
| 70 – 80 | 10 |
| 80 – 90 | 14 |
| 90 – 100 | 8 |
| 100 – 110 | 12 |
| 110 – 120 | 11 |
Related Questions
If the mean of the following distribution is 24, find the value of a.
Marks No. of students 0 – 10 7 10 – 20 a 20 – 30 8 30 – 40 10 40 – 50 5 Calculate the mean of the following distribution using step deviation method.
Marks No.of students 0 – 10 10 10 – 20 9 20 – 30 25 30 – 40 30 40 – 50 16 50 – 60 10 The weights of 50 apples were recorded as given below. Calculate the mean weight, to the nearest gram, by the step Deviation Method.
Weight in grams No.of apples 80 – 85 5 85 – 90 8 90 – 95 10 95 – 100 12 100 – 105 8 105 – 110 4 110 – 115 3 Weights of 60 eggs were recorded as given below :
Weights (in gms) Number of eggs 75 – 79 4 80 – 84 9 85 – 89 13 90 – 94 17 95 – 99 12 100 – 104 3 105 – 109 2 Calculate their mean weight to the nearest gm.