Free GCSE Statistics check

Mo plots a scatter diagram of daily maximum temperature and the number of ice creams a kiosk sells. Which variable should go on the horizontal (x) axis?

For the gym's systematic sample, the interval is 15 and the first member chosen is number 7. What number is the 5th member chosen?

A questionnaire asks "Do you exercise regularly?" Which is the best improvement?

A pie chart shows the favourite fruit of 72 people. The slice for apples has an angle of 135°. How many people chose apples?

The back-to-back stem and leaf diagram shows the test scores of 11 girls and 11 boys. Which comparison is correct?

The cumulative frequency graph shows the times of 120 runners in a fun run. Estimate the median time.

The salaries, in £ thousands, of the six staff at a small firm are 18, 19, 20, 21, 22 and 95. Which average best represents a typical salary?

The table shows the number of pets in 25 households. Work out the median number of pets.

Eleven students' test marks, in order, are 12, 15, 18, 18, 21, 23, 26, 27, 30, 34, 41. What is the interquartile range?

Eleven bus journeys took these times, in minutes: 12, 15, 17, 18, 20, 22, 23, 25, 27, 30, 41. Which values are needed to draw a box plot, as minimum, lower quartile, median, upper quartile, maximum?

The scatter diagram shows the hours each of ten netball players trained in a week and the goals they scored that week. Describe the correlation.

For the garden centre's sales 38, 52, 61, 45, 42, 57, 66, 47, work out the third 4-point moving average.

A gym membership cost £250 in the base year. The index number for this year is 112. Work out this year's cost.

A drawing pin is dropped 80 times and lands point up 28 times. Estimate how many times it will land point up in 500 drops.

Two fair six-sided dice are rolled and the scores are added. Work out the probability that the total is 8.