A random sample of weekly supermarket bills was recorded in the table alongside

MATHEMATICS · Multi-part · A Level · Mathematics · Data presentation and interpretation · Data presentation and interpretation

Problem

A random sample of weekly supermarket bills was recorded in the table alongside. For the given data, estimate the:
Bill (€b)Number of families
140≤b<160140 \le b < 16027
160≤b<180160 \le b < 18032
180≤b<200180 \le b < 20048
200≤b<220200 \le b < 22025
220≤b<240220 \le b < 24037
240≤b<260240 \le b < 26021
260≤b<280260 \le b < 28018
280≤b<300280 \le b < 3007
(1) mean (2) standard deviation.

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