Sandeep sat 11 tests in January 2020 Each test was marked out of 60 Here are his test results. (a) Find the interquartile range of these test results. Show your working clearly. (3) Sandeep also sat some tests in May 2020 Each test was marked out of 60 The median of the May 2020 test results is 42 The interquartile range of the May 2020 test results is 12 (b) In which month, January or May, were Sandeep's test results more consistent? Give a reason for your answer. (1)

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