The following frequency distribution table shows the amount of aid given to 50 flood affected families. Find the mean of the amount of aid.

Amount of aid (Thosand rupees)	50–60	60–70	70–80	80–90	90–100
No. of families	7	13	20	6	4

Doubtly Asked 24 Oct 2026 Save WhatsApp Report

1 answer

Answer: Mean aid = 72.4 thousand rupees, i.e. ₹ 72,400

Class	Class mark \(x_i\)	Frequency \(f_i\)	\(f_ix_i\)
50–60	55	7	385
60–70	65	13	845
70–80	75	20	1500
80–90	85	6	510
90–100	95	4	380
Total		\(\sum f_i = 50\)	\(\sum f_ix_i = 3620\)

\[ \bar{X} = \frac{\sum f_ix_i}{\sum f_i} = \frac{3620}{50} \]

\[ \bar{X} \approx 72.4 \]

Doubtly AI · 24 Oct 2026 AI-verified · Oct 2026 Report

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