Question 250636: 1. From National Weather Service records, the annual snowfall in the TopKick Mountains has a mean of 82 inches and a standard deviation s of 12 inches. If the snowfall from 25 randomly selected years are chosen, what it the probability that the snowfall would be less than 85 inches?
2. The loan officer rates applicants for credit. Ratings are normally distributed. The mean is 240 and the standard deviation is 30. If 36 applicants are randomly chosen, what is the probability that they will have a rating between 230 and 250?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 1. From National Weather Service records, the annual snowfall in the TopKick Mountains has a mean of 82 inches and a standard deviation s of 12 inches. If the snowfall from 25 randomly selected years are chosen, what it the probability that the snowfall would be less than 85 inches?
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Find the z-value of 85.
Then find the probability that z is less than that z-value
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2. The loan officer rates applicants for credit. Ratings are normally distributed. The mean is 240 and the standard deviation is 30. If 36 applicants are randomly chosen, what is the probability that they will have a rating between 230 and 250?
Find the z-value for 230 and the z-value for 250.
Then find the probability that z is between those two values.
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Cheers,
Stan H.
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