(Answered) The compressive strength of samples of cement can be

Statistics

The compressive strength of samples of cement can be modeled by a normal distribution with a mean of 6000 kilograms per square centimeter and a standard deviation of 100 kilograms per square centimeter.

a) What is the probability that a sample's strength is less than 6250 Kg/cm2?

b) What is the probability that a sample's strength is between 5800 and 5900 Kg/cm2?

c) What strength is exceeded by 95% of the samples?

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