Q6 of 24 Page 97

Gowri asked 25 people if they liked the taste of a new health drink. The responses are,


Find the probability that a person selected at random


(i) likes the taste (ii) dislikes the taste (iii) undecided about the taste

Total number of people Gowri approached is

= 15 + 8 + 2


= 25


(i) Now as per the data 15 out of 25 people liked the drink


So, the probability as per the data provided will be,




(ii) Number of people who disliked it as per the data of 25 people is 8


So, the probability that the person will dislike the drink


⇒


(iii) Number of people who were undecided as per the data of 25 people is 2


So, the probability that the person will also be undecided about the drink


⇒


It can be noted that sum of probability is 1 as it included all the possible outcomes.


More from this chapter

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4

During the last 20 basketball games, Sangeeth has made 65 and missed 35 free throws. What is the empirical probability if a ball was selected at random that Sangeeth make a foul shot?

 5

The record of a weather station shows that out of the past 300 consecutive days, its weather was forecasted correctly 195 times. What is the probability that on a given day selected at random, (i) it was correct (ii) it was not correct.

 7

In the sample of 50 people, 21 has type “O” blood, 22 has type “A” blood, 5 has type “B” blood and 2 has type “AB” blood. If a person is selected at random find the probability that

(i) the person has type “O” blood (ii) the person does not have type “B” blood


(iii) the person has type “A” blood (iv) the person does not have type “AB” blood.

 8

A die is rolled 500 times. The following table shows that the outcomes of the die.


Find the probability of getting an outcome (i) less than 4


(ii) less than 2


(iii) greater than 2 (iv) getting 6 (v) not getting 6.