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 385 419 227 193 283 137 419

What is the (population) standard deviation of the data?

Please round your answer to the nearest integer.

Note that the correct answer will be evaluated based on the full-precision result you would obtain using Excel.

Math   Statistics-And-Probability   
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Answer #1

Let the observations is denoted by xi (i=1, 2,3,4,5,6,7)

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