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Calculate 7. The speeds, in kilometres per hour, of 200 vehicles travelling on a motorway were measured using a radar device. The results are summarised

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Calculate 7. The speeds, in kilometres per hour, of 200 vehicles travelling on a motorway were measured using a radar device. The results are summarised in the following grouped frequency table. Speed (kph.) 45-60 60-75 75-90 90-105 105-120 120-135 Frequency 12 32 56 72 20 Estimate the mean speed.

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