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Practice, difficulty 2 of 3

Grouped median

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A courier company grouped the distances (km) of its same-day deliveries in one district:

Distance (km)	Frequency
0 to under 2	6
2 to under 4	14
4 to under 6	23
6 to under 8	17
8 to under 10	17
10 to under 12	3
Total	80

Estimate the median distance by interpolation, to 2 decimal places.