9)Find the area under the standard normal curve to the right of z =-1.25. Area from table is .1056.

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10)Find the area under the standard normal curve between z = 1 and z = 2.

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Look up a z of 2. Area is .9772.

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11)The tread life of a particular brand of tire is a random variable best described by a normaldistribution with a mean of 60,000 miles and a standard deviation of 2900 miles. What is theprobability a particular tire of this brand will last longer than 57,100 miles?

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Look up a z of -1 on the standard normal table. Then, subtract your answer from 1. Area is .1587. Our

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12)The length of time it takes college students to find a parking spot in the library parking lotfollows a normal distribution with a mean of 6.5 minutes and a standard deviation of 1minute. Find the probability that a randomly selected college student will take between 5.0and 7.5 minutes to find a parking spot in the library lot.

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Look up a z of -1.5 and a z of 1.

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13)A new phone system was installed last year to help reduce the expense of personal calls thatwere being made by employees. Before the new system was installed, the amount being spenton personal calls follows a normal distribution with an average of $900 per month and astandard deviation of $50 per month. Refer to such expenses as PCEʹs (personal call expenses).Find the probability that a randomly selected month had a PCE that falls below $750.