Question Five: Calculate the first four moments about the mean from the following data. Also calculate the values of B/ and B2. (20 mks) Marks 0-10 10-20 20-30 30-40 40-50 50-60 Students 5 12 18 40 15 10 Note: B1 = U32/U23 B2 = U4/U22 English (United Kingdom) W P 21. CQuestion Four: Calculate the appropriate measure of skewness from the following distribution. (10 mks) Monthly Upto 100- 151-200 201-300 301-500 501-750 751- 1000 & income 100 150 1000 above Frequency 9 51 120 240 136 33 9 2 (United Kingdom) h O W P 21 . C hpQuestion Three: A factory produces two types of tyres. In an experiment in the working life of these tyres the following results were obtained. (10 mks) Length of 15-17 17-19 19-21 21-23 23-25 life(00's hrs) Tyre: A 50 110 260 100 80 B 40 300 120 80 60 State which type of tyre is more stable? (10 mks)