Q12 of 55 Page 623

In a one day cricket match, a batsman hits the boundary 8 times out of 48 balls he plays. Find the probability that he does not hit the boundary.

Total number balls batsman played = 48

Number of batsman hits a boundary = 8

Number of batsman doesn’t hit a boundary = 48 – 8 = 40

Probability P() =

Probability of batsman not hitting a boundary is

P(no boundary) =

The probability of losing a game is 0.6 What is the probability of winning the game?

A coin is tossed 50 times and the tail appears 28 times. In a single throw of a coin. What is the probability of getting a head?

Two coins are tossed simultaneously 80 times and the outcomes were recorded as under:

Outcome	Two heads	One head	No head
Frequency	24	36	20

If two coins are tossed at random,find the probability of getting

(i) Two heads (ii) one head (iii) no head

Marks obtained by 90 students of Class IX in a test are given below:

Marks	0-20	20-40	40-60	60-80	80-100
No of students	8	15	32	26	9

Out of these students one is chosen at random. Find the probability that the chosen student obtains

(i) less than 20% marks (ii) 80% of more marks

(iii) 60% or more marks