Mathematics
If the mean of the following distribution is 7.5, find the missing frequency f :
| Variate | Frequency |
|---|---|
| 5 | 20 |
| 6 | 17 |
| 7 | f |
| 8 | 10 |
| 9 | 8 |
| 10 | 6 |
| 11 | 7 |
| 12 | 6 |
Related Questions
Find the mean for the following distribution by short cut method:
Numbers Cumulative Frequency 60 8 61 18 62 33 63 40 64 49 65 55 66 60 Category Wages in ₹ per day No. of workers A 50 2 B 60 4 C 70 8 D 80 12 E 90 10 F 100 6 G 110 8 (i) Calculate the mean wage, correct to nearest rupee.
(ii) If the number of workers in each category is doubled, what would be the new mean wage?
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