Question

Heights (cm) of various herbs in a garden are depicted in the following plot:
Stem Leaf

$0$ $1$ $2$	$8,9,7,7$ $0,5,0$ $1,5,0$

$\text{Key}:1|6\text{means}16$
The mean height of the herbs is cm.

Answer 1

Given $\text{key}:1|6$ means $16$

$\therefore$ The data points are obtained by merging the stem number with corresponding leaf numbers.
Example:
Given plot: Stem Leaf

$0$ $1$ $2$	$8,9,7,7$ $0,5,0$ $1,5,0$

Data points: $7,7,8,9,10,10,15,20,21$ and $25.$

Mean of data set
$=\frac{\text{Sum of all data points}}{\text{Total number of data points}}$
$=\frac{7+7+1+8+9+10+15+20+21+25}{10}$
$=\frac{123}{10}$
$=12.3\text{cm}$