# RS Aggarwal Solutions Class 9 Mathematics Solutions for Probability Exercise 19 in Chapter 19 - Probability

Question 2 Probability Exercise 19

Two coins are tossed 400 times and we get Two heads: 112 times; one head: 160 times; 0 head: 128 times.

When two coins are tossed at random, what is the probability of getting

It is given that

Number of trials = 400

Number of times 2 head = 112

Number of times 1 head = 160

Number of times 0 head = 128

Take E1, E2 and E3 as the events

(i) So we get

P (E1) = number of times 2 head/ number of trials

By substituting the values

P (E1) = 112/ 400

We get

P (E1) = 0.28

(ii) So we get

P (E2) = number of times 1 head/ number of trials

By substituting the values

P (E2) = 160/ 400

We get

P (E2) = 0.4

(iii) So we get

P (E3) = number of times 0 head/ number of trials

By substituting the values

P (E3) = 128/ 400

We get

P (E3) = 0.32

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