TS EAMCET · Maths · Statistics
The variance of the following frequency distribution is
- A 165.3
- B 161.1
- C 282.1
- D 152.5
Answer & Solution
Correct Answer
(B) 161.1
Step-by-step Solution
Detailed explanation
Given frequency distribution \(\because \quad N=\Sigma f_i=70\) \(\therefore\) variance \(\left(\sigma^2\right)=\frac{1}{N} \Sigma f_i x_i^2-\left[\frac{1}{N} \Sigma f_i \cdot x_i\right]^2\) \(=\frac{1}{70}(42150)-\left[\frac{1}{70}(1470)\right]^2=\frac{4215}{7}-441\)…
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