Q. 23.9( 13 Votes )

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?

Answer :

Total number times coin tossed: 400


Number of times Two heads occurred: 112


Number of times One head occurred: 160


Number of times No head (zero head) occurred: 128


Probability P()=


(i). Let p(H1) be probability of getting Two heads


P (H1) =


P (H1) = = 0.28


(ii). Let p(H2) be probability of getting One head


P (H2) =


P (H2) = = 0.4


(iii). Let p(H3) be probability of getting No head


P (H3) =


P (H3) = = 0.32


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