Surface and determining the amount lost

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Reference no: EM131820559

Water permeability of concrete can be measured by letting water flow across the surface and determining the amount lost (in inches per hour). Suppose that the permeability index x for a randomly selected concrete specimen of a particular type is normally distributed with mean value 1000 and standard deviation 150.

a. How likely is it that a single randomly selected specimen will have a permeability index between 850 and 1300?

b. If the permeability index is to be determined for each specimen in a random sample of size 10,

how likely is it that the sample mean permeability index will be

i. between 950 and 1100?

ii. between 850 and 1300?

Reference no: EM131820559

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