A) 80.33
B) 78.00
C) 188.66
D) 177.33
Correct Answer: B
Solution :
Corrected value \[\Sigma x=170-20+30=180\] and \[\Sigma {{x}^{2}}=2830-{{(20)}^{2}}+{{(30)}^{2}}=3330\] \[\therefore \]Corrected variance \[=\frac{\Sigma {{x}^{2}}}{n}-{{\left( \frac{\Sigma x}{n} \right)}^{2}}\] \[=\frac{3330}{15}-{{\left( \frac{180}{15} \right)}^{2}}\] \[=222-144=78\]You need to login to perform this action.
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