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December 21, 2014

December 21, 2014

Posted by **penelope** on Friday, July 12, 2013 at 6:31pm.

What is the chance 20 cars chosen at random will have an average load of less than 74.7 tons of coal?

1.Enter the average of the box:

2.Enter the SD of the box:

3.Enter the number of draws from the box:

4.Calculate the expected value for the average (EVave):

5.Calculate the standard error for the average (SEave):Round to three decimal places.

6.Calculate the chance 20 cars chosen at random will have an average load of less than 74.7 tons of coal. Round your answer to one decimal place.

- Stats () -
**PsyDAG**, Saturday, July 13, 2013 at 1:15pmYou can answer 1-3 just by citing the data.

EVave = sample mean

SEave = SEm = SD/√n

Z = (score-mean)/SEm

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

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