Given below is the frequency distribution table regarding the concentration of sulphur dioxide in the air in parts per million of a certain city for 30 days.

Find the probability of concentration of sulphur dioxide in the interval 0.12-0.16 on any of these days.

Two unbiased dice are tossed together. Find the probability that the total of the number on the dice is greater than 9.

Three coins are tossed simultaneously 200 times with the following frequencies of different outcomes:

Find the probability of getting at most two heads.

The following table gives the life time of 400 neon lamps:

A bulb is selected at random. Find the probability that the lifetime of the selected bulb is:

(i) less than 400

(ii) between 300 to 800 hours

(iii)at least 700 hours.

Tickets numbered 1 to 15 are mixed up, and then a ticket is drawn at random. What is the probability that the ticket drawn is a multiple of 4?