Required: Find range and standard deviation for each set of data? which data set is more variable? Explain why the standard deviation is the best measure of dispersion? Draw and analyze suitable graph for the data?

The Scottish Executive, Analytical services Division Transport statistics, Compiles data on motorcycles casualties. During one year, monthly casualties resulting from motorcycle accidents in Scotland for build-up roads and honbuilt up yoads were as follows: Month Built- UP Non - BuiltUP January 26 16 February 38 9 March 38 29 April 48 May 61 73 June 53 75 July 91 August 90 69 September 8 8 75 october 51 28 November 65 15 December 40 12