Sec 3/4 E Math T14-Q38 - Analysing vehicle speeds

Sec 3/4 E Math T14-Q38 - Analysing vehicle speeds

Secondary 3
Original parallel to Sec3&4 E Math FA

The speeds, in kilometres per hour, of ten vehicles are \(42, 48, 51, 53, 57, 60, 62, 68, 75, 84\).

  1. Calculate the mean speed.
  2. Find the median and interquartile range.
  3. The speed limit is \(70\,\text{km/h}\). Find the percentage of vehicles exceeding the speed limit.

Solution:

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Answer:(a) \(60\,\text{km/h}\); (b) median \(58.5\,\text{km/h}\), IQR \(17\,\text{km/h}\); (c) \(20\%\).

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