Sets, data, the mean and frequency
Answers are for parents and teachers.
1
How many elements are in the set of one-digit odd natural numbers?
5
2
Find the mean of 15, 20, 25, 20.
20
3
Six pupils have an average score of 18. What is their total score?
108
4
Of 40 pupils, 18 chose maths, 12 chose science and the rest chose music. How many chose music?
10
5
A coin was tossed 40 times and heads came up 22 times. How many times did tails come up?
18