Averages

Are these statistical statements sometimes, always or never true? Or it is impossible to say?

If you have a large supply of 3kg and 8kg weights, how many of each would you need for the average (mean) of the weights to be 6kg?

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?