1.

If mean and standard deviation of 5 observations x_1,x_2,x_3,x_4 are 10 and 3 respectively , then the variance of 6 observation x_1,x_2,…..x_5 and -50is equal to:

Answer»

`582.5`
` 507.5`
` 586.5`
` 509.5`

ANSWER :B


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