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3 What is the most common number ? 4 3 6 2 3 (The mode) What is the middle number ? 1 2 3 5 7 10 (The median) 11 Subtract the largest number from the smallest number 1 2 3 5 7 10 (The range) 11 mean = 1 To get the mean... Divide answer a (total) by answer b (how many numbers) answer a answer b How many numbers are there? What is the total of these number ? 3 3 ÷ 5 8 = After you have put these numbers in order, what is the middle number ? (The median) 1 7 5 2 4 5 5 6 What is the mode ? 4 2 4 4 7 9 5 6 What is the modal value ? 4 2 7 7 7 What is the median of these numbers? 3 Hint : half way 4 6 8 9 9 What is the range of values? 23 5 7 3 6 14 Find the mean of 4 and 12 Find the mean, mode, median and range of these numbers median = mode = 4 4 8 9 mean = range = 10 Frequency What is the modal grade? A B C D E Grades Science 8 6 4 2 0 Pupils tests results in Maths and Science ● ● 2 ● 4 ● Maths What is the range of marks for the Maths test? 6 ● 8 ● 10 ● 12 Find the mean Mean = Time (mins) 2 4 1 3 total Frequency 10 4 2 3 1 ÷ 10 Total = Time x Frequency 4 3 6 Estimate mean = Find an estimate of the mean Time 1≤ x < 3 3 ≤ x < 5 7 ≤ x < 9 5 ≤ x < 7 (mins) Frequency 10 3 4 2 1 total x Midpoint 4 2 6 ÷ Total 10 = = Midpoint x Frequency 16 8 6 |