For the questions with numbers 92 and 93, given above, draw a :

(i) Histogram

(ii) Frequency polygon

(iii) Frequency polygon using histogram.

Find the mean of the following numbers :

62, 58, 84, 71, 68, 70, 53, 63, 56 and 65.

The mean of 20 numbers is 20. If 2 is added to each of the first 10 numbers, find the mean of the new set of 20 numbers.

The mean of 2, 12, 4, 9, 5 and 16 is x. The median of 4, 3, x, x - 1, 12, and 16 is y. Find the values of x and y.