WorkingNormal Distribution[1]

# WorkingNormal Distribution[1] - Working with the Normal...

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Working with the Normal Distribution and z scores: Practice Problems 1) Assume that professors’ evaluation scores are normally distributed with a mean of 100 and a standard deviation of 25 (ie. µ=100 and ó = 25). What is the probability that a professor would get an evaluation above 115? Answer: .2743 2) If IQ scores are normally distributed with a mean of 100 and a standard deviation of 20, then the probability of the persons having an IQ score of at least 130 is a) .4332 b) .3000 c) .9332 d) .0668 3) A bank finds that the balances for its customers and their savings accounts are normally distributed with a mean of \$500 and a standard deviation of \$50. The probability that a randomly selected account has a balance of more than \$600 is a) .4772 b) .0228 c) .9772 d) .0000 4) The lifetime of a certain brand of tires is normally distributed. The average lifetime of a tire is 50,000 miles with a lifetime standard deviation of 8400 miles. The probability that a randomly

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## This note was uploaded on 09/08/2010 for the course SOCS 15 at San Jose State.

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WorkingNormal Distribution[1] - Working with the Normal...

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