Q1. Two brands of tyres are tested with the following results; Life (in '000 miles) X Y 10-15 2 3 15-20 2.2 26 52 74 20-25 25-30 8 0 30-35 (a) Which brand of tyres have greater average life? (b) Compare the variability (standard deviation and coefficient of variation) and state which b and tyres would you use on your eet of trucks? Q2. Calculate coefficient of quartile deviation from the following data