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13. Probability
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Q1 of 128 Page 13

The probability that it will rain tomorrow is 0.85. What is the probability that it will not rain tomorrow?

P(happening) + P’(not happening) = 1


Given: P = 0.85


∴ P’ = 1 – 0.85 = 0.15


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2

A die is thrown. Find the probability of getting:

(i) a prime number


(ii) 2 or 4


(iii) a multiple of 2 or 3


(iv) an even prime number


(v) a number greater than 5


(vi) a number lying between 2 and 6

3

In a simultaneous throw of a pair of dice, find the probability of getting:

(i) 8 as the sum


(ii) a doublet


(iii) a doublet of prime numbers


(iv) a doublet of odd numbers


(v) a sum greater than 9


(vi) an even number on first


(vii) an even number on one and a multiple of 3 on the other


(viii) neither 9 nor 11 as the sum of the numbers on the faces


(ix) a sum less than 6


(x) a sum less than 7


(xi) a sum more than 7


(xii) at least once


(xiii) a number other than 5 n any dice.


(xiv) even number on each die


(xv) 5 as the sum


(xvi) 2 will come up at least once


(xvii) 2 will not come either time

4

Three coins are tossed together. Find the probability of getting:

(i) exactly two heads


(ii) at most two heads


(iii) at least one head and one tail.


(iv) no tails

5

What is the probability that an ordinary year has 53 Sundays?

Questions · 128
13. Probability
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