Mathematics

Mathematics

Problem

The number of litres of petrol purchased by a random sample of motor vehicle drivers is shown alongside. For the given data, estimate the:

Litres ( $L$ )	Number of vehicles
$15 \le L < 20$	5
$20 \le L < 25$	13
$25 \le L < 30$	17
$30 \le L < 35$	29
$35 \le L < 40$	27
$40 \le L < 45$	18
$45 \le L < 50$	7

a. mean b. standard deviation.

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