Mathematics
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.
Related Questions
Category Wages in ₹ per day No. of workers A 500 2 B 600 4 C 700 8 D 800 12 E 900 10 F 1000 6 G 1100 8 (i) Calculate the mean wage, correct to the nearest rupee.
(ii) If the number of workers in each category is doubled, what would be the new mean wage?
The mean of the following data is 16. Calculate the value of f.
Marks No. of students 5 3 10 7 15 f 20 9 25 6 Calculate the mean of the following distribution:
Class interval Frequency 5 - 15 2 15 - 25 6 25 - 35 4 35 - 45 8 45 - 55 4 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