Q. 34.1( 9 Votes )

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?

Answer :

Total number times coins tossed: 200


Number of times Three heads occurred: 39


Number of times Two head occurred: 58


Number of times One heads occurred: 67


Number of times No(Zero) head occurred: 36


Probability P() =


(i). Let P(H1) be probability of getting Three heads


P (H1) =


P (H1) = = 0.195


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


P (H2) =


P(H2) = = 0.335


(iii). Let P(H3) be probability of getting No heads (zero heads)


P (H3) =


P (H3) = = 0.18


(iv). Let P(H4) be probability of getting Two heads


P (H4) =


P (H4) = = 0.29


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