Question

Unit sales for new product ABC have varied in the first seven months of this year...

Unit sales for new product ABC have varied in the first seven months of this year as follows:

Month Jan Feb Mar Apr May Jun Jul
Unit Sales 145 492 319 265 389 321 180

What is the (population) Pearson's coefficient of skewness of the data?

Please round your answer to the nearest hundredth.

Math   Statistics-And-Probability   
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Answer #1
unit sale, X Deviation ( X-M) square deviation
145 -156.57 24514.61
492 190.43 36263.04
319 17.43 303
265 -36.57 1337
389 87.43 7643
321 19.43 377
180 -121.57 14779
M : 301.57 SS : 85219.71

median = 319

Standard Deviation calculation

N=7

Mean = 2111/7 = 301.57
SS = 85219.71
σ2 = SS⁄N = 85219.71/7 = 12174.24
standard deviation ,

=√σ2 = √12174.24 = 110.34

the Pearson's coefficient of skewness of the data is

- 0.47

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