Dianne has a choice of two routes to drive to work. She timed her journey along each route on  several occasions and the times in minutes are given below: Town route: 15, 16, 20, 28, 21 Country route: 19, 21, 20, 22, 18 (i) Calculate the mean and standard deviation (to one d. p.) of each set of journey times. (ii) Which route would you recommend?

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