JEE Math Practice Question
If mean and standard deviation of 5 observations x1, x2, x3, x4, x5 are 10 and 3, respectively, then the variance of 6 observations x1, x2, ….., x5 and –50 is equal to
- A.582.5
- B.507.5
- C.586.5
- D.509.5
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