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22 July, 11:40

For 10 days in a row Fiona and Gary timed how long they brushed their teeth

Find the mean of each data set

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  1. 22 July, 12:55
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    (X (Fiona) + Y (Gary)) / 20 (10 days for each of them so it’s 20)

    (x+y) / 6
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