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

Question 5 Probability Exercise 19

In a survey of 200 ladies, it was found that 142 like coffee, while 58 dislike it. Find the probability that a lady chosen at random

(i) likes coffee,

(ii) dislikes coffee.

It is given that

Number of ladies who like coffee = 142

Number of ladies who dislike coffee = 58

Consider E1 as the event that the selected ladies like coffee

So we get

P (E1) = number of ladies who like coffee/ number of trials

By substituting the values

P (E1) = 142/ 200

We get

P (E1) = 0.71

Consider E1 as the event that the selected ladies dislike coffee

So we get

P (E2) = number of ladies who dislike coffee/ number of trials

By substituting the values

P (E2) = 58/ 200

We get

P (E2) = 0.29

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