Find the mean of the data $10, 15, 17, 19, 20$ and $21$ .

11

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16

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17

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21

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Solution

The correct option is C $17$
Data observations are: $10, 15, 17, 19, 20 a n d 21$
mean = $\frac{s u m}{N u m b e r}$
mean = $\frac{10 + 15 + 17 + 19 + 20 + 21}{6}$
mean = $\frac{102}{6}$ = $17$

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