The water bills (in rupees) of $20$ houses of a certain locality for a month are given below:

$110, 120, 160, 45, 60, 80, 135, 145, 65, 85, 100, 105, 55, 40, 35, 90, 125, 38, 58, 75$

Prepare a frequency table taking class intervals $30-60$ and $60-90$ etc. and draw a histogram.

A bag contains $12$ red, $15$ blue and $20$ white balls. A ball is drawn at random. Find the probability that the ball is white.

A bag contains $12$ red, $15$ blue and $20$ white balls. A ball is drawn at random. Find the probability that the ball is red or blue.

A bag contains $12$ red, $15$ blue and $20$ white balls. A ball is drawn at random. If the probability that the ball is blue or white is $\frac{m}{n}$, then find the value of $m+n.$

A bag contains $12$ red, $15$ blue and $20$ white balls. A ball is drawn at random. Find the probability that the ball is not white.