Suppose the force acting on a column that helps to support a building is normally distributed with mean 15.0 kips and standard deviation 1.25 kips. What is the probability that the force    a. Is at most 18 kips?    b. Is between 10. and 12 kips?    c. Differs from 15.0 kips by at most 2 standard deviations? Use z-score values

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