(c) The table shows the frequency distribution of marks obtained by 50 students in a test. Marks 1-10 11-20 21-30 31-40 41-50 51-60 61-70 71-80 81-90 91-100 Frequency 2 3 5 x 10 9 6 4 y 1 If the mean of the distribution is 47-7, find, using an assumed mean of 45-5. (i) the value of the constants x and y, (ii) the variance of the distribution.

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