- workers in a factory commute from their homes to the factory. The table below shows the distances in kilometers covered by the workers.
The mean distance covered was 14.5 km.
(a) Determine the value of t and hence the standard deviation of the distance correct to 2 decimal places. (6 marks)
(b) calculate, correct to 2 decimal places, the interquartile range of the distances (4 marks).