Varatta Enterprises sells industrial plumbing valves. The following table lists the annual sales amounts for every salesperson in the organization for the most recent fiscal year.

SalespersonSales Amount ($1000)SalespersonSales Amount ($1000)Joseph148Wei466Jennifer231Samantha411Phillip546Erin299Stanley329Dominic322Luke294Charlie189Lexie193Amol212Margaret367Lenisa414(a)

Compute the mean (in $), variance, and standard deviation (in $) for these annual sales values. (Round your answers to the nearest whole number.)

mean$variancestandard deviation$

(b)

In the previous fiscal year, the average annual sales amount was $300,000 with a standard deviation of $95,000. Discuss any differences you observe between the annual sales amount in the most recent and previous fiscal years.

The mean sales amount has

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decreased

increased

not changed

from the previous to most recent fiscal year. The amount of change is

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tiny

large

compared to the standard deviation in either fiscal year. Therefore, there is a strong likelihood that

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this change is the result of simple randomness.

there is a smaller demand for these products in the most recent year.

there is a greater demand for these product in the most recent year.