A) 78
B) 188.66
C) 177.33
D) 8.33
Correct Answer: A
Solution :
[a]:\[n=15,\Sigma {{x}^{2}}=2830,\Sigma x=170\] (New)\[\Sigma {{x}^{2}}=2830-400+900=3330\] (New)\[\Sigma x=170-20+30=180\] Corrected variance, i.e., \[{{\sigma }^{2}}\] \[=\frac{(New)\Sigma {{x}^{2}}}{n}-{{\left( \frac{(New)\Sigma x}{n} \right)}^{2}}\] \[=\frac{3330}{15}-{{\left( \frac{180}{15} \right)}^{2}}=78.0\]You need to login to perform this action.
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