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Unformatted text preview: b. Find variance and standard deviation. 4. The grade of the first examination in Business 201 is as follows: Grade Frequency (f i ) Relative Frequency (f i / f i ) 90100 16 8089 36 7079 90 6069 30 5059 28 f i = a. Find the relative frequency. b. Present this set of data by using the relative frequency histogram. c. Calculate the mean (), variance ( 2 ) and standard deviation (). [Hint: use midpoint to to represent the value of each class] n 5. A data set contains the observations {3, 1, 3, 2, 1}. Note that represents . Find i=1 a. x b. x 2 c. (x 2). d. (x1) 2 . e. (x) 2 . f. x 2 [(x) 2 /5] g. (x 3) 2 . h. x 2 6 6. Show that n _ (x i x) = 0. i = 1...
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 Shieh,YeungNan

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