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The numbers of books purchased by …

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The numbers of books purchased by each of the 15 persons from a book store are as follows. 1,0, 2, 2, 3, 4, 2, 7, 2, 2, 5, 4, 2, 1, 2. Find the modal value for the number of books purchased. 12. The median of observations a – 5, a+ 1, a+ 2, a – 3, a is 10. Find a. 13. The 25th and the 75th percentiles of a data set are 20 and 36 respectively. Find the coefficient of quartile deviation of the data set. 14. The Coefficients of variation of two series are 30% and 25% and their standard deviations are 15 and 9 respectively. Find their mean.
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