Mathematics
Calculate the mean of the following distribution using step deviation method :
| Marks | Number of students |
|---|---|
| 0 - 10 | 10 |
| 10 - 20 | 9 |
| 20 - 30 | 25 |
| 30 - 40 | 30 |
| 40 - 50 | 16 |
| 50 - 60 | 10 |
Related Questions
Marks obtained by 40 students in a short assessment is given below, where a and b are two missing data :
Marks No. of students 5 6 6 a 7 16 8 13 9 b If the mean of the distribution is 7.2, find a and b.
Calculate the mean of the following distribution :
Class interval Frequency 0 - 10 8 10 - 20 5 20 - 30 12 30 - 40 35 40 - 50 24 50 - 60 16 The data on the number of patients attending a hospital in a month is given below. Find the average (mean) number of patients attending the hospital in a month using the short cut method.
Take assumed mean as 45. Give your answer correct to 2 decimal places.
Number of patients Number of days 10 - 20 5 20 - 30 2 30 - 40 7 40 - 50 9 50 - 60 2 60 - 70 5 The following table gives the daily wages of workers in a factory :
Wages in ₹ No. of workers 45 - 50 5 50 - 55 8 55 - 60 30 60 - 65 25 65 - 70 14 70 - 75 12 75 - 80 6 Calculate their mean by short cut method.