Q. 22

Mark (√) against the correct answer in each of the following:

A coin is tossed 5 times. What is the probability that tail appears an odd number of times?





Answer :

Using Bernoulli’s Trial P(Success=x) = nCx.px.q(n-x)

x=0, 1, 2, ………n and q = (1-p)

As the coin is tossed 5 times the total number of outcomes will be .

And we know that the favourable outcomes of getting the odd tail number of times ,successes will be, getting a tail

The probability of success is and of failure is also

5C1()1()4 +5C3()3()2 +5C5 ()5()0

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