Mathematics

Mathematics

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
$140 \le b < 160$	27
$160 \le b < 180$	32
$180 \le b < 200$	48
$200 \le b < 220$	25
$220 \le b < 240$	37
$240 \le b < 260$	21
$260 \le b < 280$	18
$280 \le b < 300$	7

a. mean b. standard deviation.

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