Mathematics
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 |
Related Questions
Given below are the daily wages of 200 workers in a factory :
Daily Wages (in ₹) Number of Workers 240 – 300 20 300 – 360 30 360 – 420 20 420 – 480 40 480 – 540 90 Calculate the mean daily wages.
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 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 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