In the construction industry,compressive strength of concrete is a crucial characteristic.Suppose for a particular residential construction job the concrete tested after 3 days should have a mean compression strength of  = 3000 psi with a standard deviation of  = 50 psi.It is known that compressive strength of concrete is Normally distributed.On a construction site,a sample of n = 5 specimens is selected and tested after 3 days.If the concrete has the desired characteristics,what is the probability that the sample mean will be larger than 3060 psi?

A) 0.996
B) 0.004
C) 0.885
D) 0.115
E) This can't be determined because the sample size n = 5 is much too small to rely on the Normal distribution for calculation of the required probability.

December's electricity bill of $876.60 represents 22.5% of the total December expenses for Westcamper's Sheet Metal Fabricating. Compute Westcamper's total expenses in December.​

Calculate missing value for the promissory note:

Given a Poisson random variable X,where the average number of successes occurring in a specified interval is 1.8,then P(X = 0) is:

A) 1.8
B) 1.3416
C) 0.1653
D) 6.05

Elizabeth has been able to transfer a $25,000 retiring allowance into an RRSP. She plans to let the RRSP accumulate earnings at the rate of 7% compounded annually for 10 years and then purchase a 15-year annuity making payments at the end of each quarter. What size of payment can she expect if the funds in the annuity earn 5.2% compounded quarterly?

How many permutations of 3 colors can be drawn from a group of 20 colors?
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