Question

Three coins are tossed: a nickel, dime and penny with probabilities of head known to be 0.4, 0.5 and 0.2, respectively. What is the probability that of three tails?

Answer 1

There are three coins : Nickel, Dime and Penny.

We know that probability of an event lies between 0 and 1.

There are two possibilities of tossing a coin : Head and Tail.

We are given the probabilities of head.

We have to find probabilities of tails.

We know that P(Head) + P(Tail) = 1.

i.e, P(Tail) = 1-P(Head)

So, P(Tail of Nickel) = 1-0.4 =0.6

P(Tail of Dime) = 1-0.5 =0.5

P(Tail of Penny) = 1-0.2 =0.8

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