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 / Σf i ) 90100 16 8089 36 7079 90 6069 30 5059 28 Σf i = a. Find the relative frequency. b. Present this set of data by using the relative frequency histogram. c. Calculate the mean (μ), variance (σ 2 ) and standard deviation (σ). [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 Σ represents Σ . Find i=1 a. Σx b. Σx 2 c. Σ(x – 2). d. Σ (x1) 2 . e. (Σx) 2 . f. Σx 2 – [(Σx) 2 /5] g. Σ(x – 3) 2 . h. Σx 2 6 6. Show that n _ Σ (x i – x) = 0. i = 1...
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 Shieh,YeungNan
 Statistics, Standard Deviation, Mean

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