A milk centre sold milk to 50 customers. The table below gives the number of customers and the milk they purchased. Find the mean of the milk sold by direct method.

Milk Sold (Litre)	1–2	2–3	3–4	4–5	5–6
No. of Customers	17	13	10	7	3

Doubtly Asked 24 Oct 2026 Save WhatsApp Report

1 answer

Answer: Mean milk sold = 2.82 litre

Class	Class mark \(x_i\)	Frequency \(f_i\)	\(f_ix_i\)
1–2	1.5	17	25.5
2–3	2.5	13	32.5
3–4	3.5	10	35
4–5	4.5	7	31.5
5–6	5.5	3	16.5
Total		\(\sum f_i = 50\)	\(\sum f_ix_i = 141\)

\[ \bar{X} = \frac{\sum f_ix_i}{\sum f_i} = \frac{141}{50} \]

\[ \bar{X} \approx 2.82 \]

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

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