24.3 Averages and range — Practise with help

The order is 2, 4, 7, 9, and $7+9+4=20$. If either answer differs, revisit ordering numbers and addition before continuing.

Put the values in order first, then look at the one in the middle.

In order the values are $1, 3, 4$.

The middle value is 3, so the median is 3.

Add the values, then divide by how many values there are.

The total is $2+4+6=12$, and there are 3 values.

Mean $=12\div3=4$.

For the median, find the middle of the ordered list. For the range, subtract the smallest value from the largest.

The middle pair is the 2nd and 3rd values, which are both 3.

Median $=(3+3)\div2=3$; range $=8-2=6$.