Fundamentholfundamenthol
JEE Main2019Math
Q.

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 : 

  1. A

    586.5

  2. B

    582.5

  3. C

    509.5

  4. D

    507.5 

Solution

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