The variable X is normally distributed.The mean is = 22.0 and the standard deviation is = 2.4. Find P(19.7 The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.32 inches? A) 47.72% B) 37.45% C) 2.28% D) 97.72% The National Weather Service keeps records of snowfall in mountain ranges. Records indicate that in a certain range, the annual snowfall has a mean of 83 inches and a standard deviation of 14 inches. Suppose the snowfalls are sampled during randomly picked years. For samples of size 49, determine the mean and standard deviation of ) = 2; = 83 B) x=14; x=83 C) = 83; =14 D) x=83; x=2