Presenter 1: Now, let's try to work out how long it would take her to ... To find the mean: (5.2 + 5.6 + 5.7) ÷ 3 = 5.5 seconds. Tip: Calculate the numbers in brackets first.

Presenter 1: Now, let's try to work out how long it would take her to ... To find the mean: (5.2 + 5.6 + 5.7) ÷ 3 = 5.5 seconds. Tip: Calculate the numbers in brackets first.

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