Question
Asked Dec 5, 2019
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A coin is tossed three times. Let X be the number of heads that turn up. Find V (X).

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Expert Answer

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Step 1

Given:

A coin is tossed three times.

X be the number of heads that turn up.

Step 2

We can have 2^3=8 possible outcomes which are listed below (H=head, T=tail)

{HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}

Let, X be the number of heads that turn up

Therefore, the probability distribution is,

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P(x) х 1/8 3/8 3/8 1/8 3

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Step 3

We have to find V(x)

Formula...

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V(x) = E(x³)-[E(x)]

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Math

Probability

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