Maths

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A-Level

Statistical Sampling

Question

If the data is grouped can you work out the exact mean or do you have to estimate it?

2 years ago

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Rebeka Dibbert


1 Answer

Devan-Kumar M Profile Picture
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If your data is grouped you most likely have to estimate the mean by assuming the average of the data points within a given interval is the centre of the interval.


An example would be if I was told 5 people had between 25 and 30 tickets to football games within a given season and I was asked to estimate the mean. Here, I must assume the mean of the 5 people’s responses lies directly in the middle of 25 and 30, namely 27.5.

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