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Christine Farr

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Question 11.If X ~ N (m = 50,s =15), then the mode of X is equal to:5015502225None of the aboveQuestion 21.If X ~ N (m = 50,s =15), then the standard deviation of X is equal to:5015502225None of the aboveQuestion 31.Let X be a random variable with the standard normal distribution.Find: P(X > 1.23).0.89070.10930.90320.8849None of theaboveQuestion 41.If z = 3 , the area under the standard normal curve is equal to:0.61790.99870.75800.9995Question 51.A bank has kept records of the checking balances of its customers anddetermined that the average daily balance of its customers is R300 with a standarddeviation of R48. A random sample of 144 checking accounts is selected.What is the probability that the sample mean will be less than R308?0.04950.97720.28570.8413Question 61.The average lifetime of a light bulb is 3,000 hours with a standard deviation of696 hours. A simple random sample of 36 bulbs is taken.What is the probability that the average life in the sample will be less than 3,180.96hours?0.84130.04820.02940.9406

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