Find the value of p for the following distribution whose mean is 16.6.

The time taken, in seconds, to solve a problem by each of 25 pupils is as follows:

16, 20, 26, 27, 28, 30, 33, 37, 38, 40, 42, 43, 46, 46, 46, 48, 49, 50, 53, 58, 59, 60, 64, 52, 20

(a) Construct a frequency distribution for these data, using a class interval of 10 seconds.

(b) Draw a histogram to represent the frequency distribution.

Find the mean of the following data:

Candidates of four schools appear in a mathematics test. The data were as follows:

If the average score of the candidates of all the four school is 66, find the number of candidates that appeared from school III.

To Find: Number of candidates that appeared from school III

Find the median of the following data: 41, 43, 127, 99, 61, 92, 71, 58, 57 if 58 replaced by 85, what will be the new median.