Mathematics
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 |
Related Questions
The following table gives the marks scored by a set of students in an examination. Calculate the mean of the distribution by using the short cut method.
Marks Number of students 0 – 10 3 10 – 20 8 20 – 30 14 30 – 40 9 40 – 50 4 50 – 60 2 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.
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 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