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 done mean wages correct to the nearest rupees.
(ii) If the number of workers in each categories double 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:
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Class interval Frequency 0 - 10 8 10 - 20 5 20 - 30 12 30 - 40 35 40 - 50 24 50 - 60 16