Averages

problem
Growing families

Age

11 to 14

Challenge level

What do these statistics about family size mean?
problem
Bat wings

Age

11 to 14

Challenge level

Two students collected some data on the wingspan of bats, but each lost a measurement. Can you find the missing information?
problem
French test

Age

11 to 14

Challenge level

What was the average score in this French test?
problem
Average temperature

Age

11 to 14

Challenge level

The average temperature of six cities is 5$^\circ$C. What is the average temperature when two cities are added?
problem
Range of averages

Age

11 to 14

Challenge level

Find these 4 numbers, given their mode, median and range.
problem
Number of arms

Age

11 to 14

Challenge level

What is the probability that the next person you meet has an above average number of arms?
problem
Maximum mean

Age

14 to 16

Challenge level

What is the largest that the mean of these numbers could be?
problem
The average age

Age

11 to 14

Challenge level

Given this information about averages, find the ages of these teachers.
problem
Unequal averages

Age

11 to 14

Challenge level

Play around with sets of five numbers and see what you can discover about different types of average...
problem
Half a minute

Age

11 to 14

Challenge level

Anna, Ben and Charlie have been estimating 30 seconds. Who is the best?