Question

The stem and leaf plot shows the ages of the people waiting outside a store when it opened. What is the mean age of the people?

• A. $2$
• B. $3$
• C. $18$
• D. $22$
• E. $23$

Answer 1

The correct option is D $22$

$\Rightarrow$ We count the number of digits on the right of the line (leaves). There were $9$ people waiting outside a store.

$\Rightarrow$ The ages are $11,12,13,21,23,25,30,31$ and $32$

$\Rightarrow$ Sum of all ages $=11+12+13+21+23+25+30+31+32=198$

$\Rightarrow$ $Mean=\frac{198}{9}=22$