Q.13 In the assumed mean method, if A = 45, Σ f_i = 40 and Σ f_i d_i = -80, then the mean is _____. A. 47 B. 43 C. 45 D. −2

Answer: (B) 43 x̅ = A + (Σ f_i d_i)/(Σ f_i) = 45 + (-80)/40 = 45 - 2 = 43

In the assumed mean method, if \(A = 45\), \(\sum f_i = 40\) and \(\sum f_i d_i = -80\), then the mean is _____.

Q.13 In the assumed mean method, if \(A = 45\), \(\sum f_i = 40\) and \(\sum f_i d_i = -80\), then the mean is _____.

A. 47

B. 43

C. 45

D. −2

Doubtly Asked 29 Oct 2026 Practice test ssc 10th Save WhatsApp Report

Best answer

Answer: (B) 43

\(\bar{x} = A + \dfrac{\sum f_i d_i}{\sum f_i} = 45 + \dfrac{-80}{40} = 45 - 2 = 43\)

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report

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