Find the mean variance and standard deviation using short cut method 3 mark...........

Find the mean, variance and standard deviation using short-cut method (3 marks)

Height in cms 70 – 75 75 – 80 80 – 85 85 – 90 90 – 95 95 – 100 100 – 105 105 – 110 110 – 115 Frequencies 3 4 7 7 15 9 6 6 3

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