Third step is to find fi*ui for all i’s   & then use the formula. Download free PDF of best NCERT Solutions , Class 10, Math, CBSE- Statistics . Which method of finding the mean did you choose? These solutions of 10th class Maths, are helpful for students, to score well in the examination, as it works for them as a reference tool to do the revision. Midpoint (xi) = (upper limit + lower limit)/2, = 8.1 Find the midpoint of the given interval using the formula. 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14 Statistics Exercise 14.3, NCERT Solutions For Class 10 Maths Chapter 14 Statistics Exercise 14.4, Chapter 3 linear equations in two variables, Chapter 9 some applications of trigonometry. 10 … let us find class mark = ( xi – 150 ) /20 for a time period can determined. 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