Questions
The mean and variance of n values of a variable x are 0 and 02, respectively. If the VariabLe y = x2 then mean of y is
a
σ
b
σ2
c
1
d
None of these
detailed solution
Correct option is B
Given that, mean = 0 and variance =σ2( for x) Therefore, variance =σ2=Σx2n−Σxn2⇒ σ2=Σx2n−0 ⇒σ2=Σx2n Now, y=x2⇒ Σy=Σx2 ∴ y¯=Σx2n=σ2Talk to our academic expert!
Similar Questions
The standard deviation of some temperature data in oC is 5. If the data were converted into oF, the new variance would be
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