The tensile strength of paper is modeled by a normal distribution with a mean of 35 pounds

Question:

The tensile strength of paper is modeled by a normal with a mean of 35 pounds per square inch and a standard deviation of 2 pounds per square inch.
(a) What is the probability that the strength of a sample is less than 40 lb/in2?
(b) If the specifications require the tensile strength to exceed 30 lb/in2, what proportion of the samples is scrapped?
Distribution
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