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A die is thrown 100 times. Getting an ...

A die is thrown 100 times. Getting an even number is considered a successes. Find the mean and variance of successes.

A

10

B

25

C

18

D

10

Text Solution

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The correct Answer is:
B
Let `E=` Event of getting an even numbers `={2,4,6}`
`n (E)=3`
`therefore` Probability of success, `p=(3)/(6)=(1)/(2)`
and probability of failure, `q=(1)/(2)`
`therefore` Variancce `=npq=100xx(1)/(2)xx(1)/(2)=25`
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