1.

An unbiased coin is tossed 5 times. Suppose that a variable X is assigned the value k when k consecutive heads are obtained for k= 3, 4, 5 otherwise X takes the value -1. The expected value of X, is ……….

Answer»

`(1)/(8)`
`(3)/(16)`
`-(1)/(8)`
`-(3)/(16)`

ANSWER :A


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