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in Statistics and probability by (54.8k points)

An unbiased coin is tossed. If the result is a head, a pair of unbiased dice is rolled and the number obtained by adding the numbers on the two faces is noted. If the result is a tail, a card from a well-shuffled pack of eleven cards numbered 2, 3, 4,…,12 is picked and the number on the card is noted. The probability that the noted number is either 7 or 8, is 

(A) 0.24

(B) 0.244

(C) 0.024

(D) None of these

1 Answer

+1 vote
by (52.5k points)
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Best answer

Answer is (B) 0.244

Required probability = probability that either the number is 7 or the number is 8.

That is, required probability = P7 + P8

Now

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