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15. Probability
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Q1 of 55 Page 619

A coin is tossed 500 times and we get

head : 285 times, tail :215 times.


When a coin is tossed at random, what is the probability of getting


(i) a head? (ii) a tail?

Total number times coin tossed: 500


Number of times head occurred: 285


Number of times tail occurred: 215


Probability P() =


(i). Let p(H) be probability of head


P (H) =


P (H) = = 0.57


(ii). Let p(T) be probability of tale


P (T) =


P (T) =


More from this chapter

All 55 →
2

Two coins are tossed 400 times and we get

Two heads:112 times; one head 160 times ;0 times; 0 head :128 times.


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


(i) 2 heads? (ii) 1 heads? (iii) 0 head?

3

Three coins are tossed 200 times and we get

three heads:39 times; two heads: 58 times;


one head :67 times: 0 head: 36 times.


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


(i) 3 heads? (ii) 1 head? (iii) 0 head (iv) 2 heads?

4

A die is thrown 300 times and the outcomes are noted as given below.





















Outcome



1



2



3



4



5



6



Frequency



60



72



54



42



39



33



When a die is thrown at random, what is the probability of getting a


(i) 3? (ii) 6? (iii) 5? (iv)1?

5

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.

Questions · 55
15. Probability
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