Averages

What do these statistics about family size mean?

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

What was the average score in this French test?

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

Find these 4 numbers, given their mode, median and range.

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

What is the largest that the mean of these numbers could be?

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

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

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