Question

The amount collected by $15$ students for flood relief find is given below. Answer the following.

Amount	Number of students
$0-10$	$3$
$10-20$	$4$
$20-30$	$5$
$30-40$	$2$
$40-50$	$1$

(ii)Find the mean amount collected by a student.

Answer 1

We prove that

mean $=\frac{Sumofallobservation}{Numberofobservation}$

$=\frac{10\times 3+20\times 4+30\times 5+40\times 2+50\times 1}{15}$

$=\frac{30+80+150+80+50}{15}$

$=\frac{390}{15}$

mean $=26$