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Guided, difficulty 1 of 3

Estimate a mean from a grouped table

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A health screening recorded the ages of its participants:

Age (years)	Frequency
20 to under 30	8
30 to under 40	11
40 to under 50	14
50 to under 60	14
60 to under 70	9
70 to under 80	3
Total	59

Estimate the mean age, to 2 decimal places.