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Multiple choice

The mean and variances of 10 values of a variables x are 0 and ${ \sigma }^{ 2 }$. If the variable $y={ 5x }^{ 2 }$ then mean of y is:

  1. ${ \sigma }^{ 2 }$
  2. 5

  3. ${ \sigma }^{ 2 }+5$
  4. ${ 5\sigma }^{ 2 }$
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