Mathematics
Find the value of p, if the mean of the following distribution is 18.
| Variate (x) | Frequency (f) |
|---|---|
| 13 | 8 |
| 15 | 2 |
| 17 | 3 |
| 19 | 4 |
| 20 + p | 5p |
| 23 | 6 |
Related Questions
There are 50 students in a class of which 40 are boys and the rest girls. The average weight of the students in the class is 44 kg and the average weight of the girls is 40 kg. Find the average weight of boys.
The heights of 50 children were measured (correct to the nearest cm) giving the following results :
Height (in cm) No. of children 65 1 66 4 67 5 68 7 69 11 70 10 71 6 72 4 73 2 Calculate the mean height for this distribution correct to one place of decimal.
Find the mean age in years from the frequency distribution given below :
Age in years No. of persons 25 - 29 4 30 - 34 14 35 - 39 22 40 - 44 16 45 - 49 6 50 - 54 5 55 - 59 3 The mean of the following frequency distribution is 62.8. Find the value of p :
Classes Frequency 0 - 20 5 20 - 40 8 40 - 60 p 60 - 80 12 80 - 100 7 100 - 120 8