Given the mean and standard deviation of a set of marks, what is the greatest number of candidates who could have scored 100%?

Given a probability density function find the mean, median and mode of the distribution.

Can you make all of these statements about averages true at the same time?

Find the value of $m$ from these statements about a group of numbers

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

What do these statistics about family size mean?

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

Can you decide whether these short statistical statements are always, sometimes or never true?

How can people be divided into groups fairly for events in the Paralympics, for school sports days, or for subject sets?

Kyle and his teacher disagree about his test score - who is right?

Charlie has moved between countries and the average income of both has increased. How can this be so?