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(Solved): A History Test Was Done By 51 Students. The Ratings Were Between 50 And 90 Points, These Were Classi ...

A history test was done by 51 students. The ratings were between 50 and 90 points, these were classified in 8 class intervals of 6 units in length. The frequency distribution table is as follows. Find S_{n}^{2} (Variance) by its definition, then find S_{n} . Calculate the measures of central tendency, kurtosis and asymmetry and interpret the results. Is the empirical rule fulfilled?

Class i Class mark (xi) Frequency (fi) 1 51 " 57 63 69 75 93

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