Mathematics

Problem

1. a Estimate the mean of the following grouped data.

$x$	$10 < x \le 20$	$20 < x \le 30$	$30 < x \le 50$	$50 < x \le 60$
Frequency	10	12	15	13

2. b Explain why it is only an estimate. a. a Estimate the mean of the following grouped data.

$x$	$10 < x \le 20$	$20 < x \le 30$	$30 < x \le 50$	$50 < x \le 60$
Frequency	10	12	15	13