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The mean and variance of x1,x2,x3,x4,x5 ...

The mean and variance of `x_1,x_2,x_3,x_4,x_5` is `24/5 and 194/25` respectively. If mean and variance of first four observation is `7/2 and a`, then the value of `4a+x_5` is

A

13

B

15

C

17

D

18

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