Automatic banking machine (ABM) customers can perform a number of transactions quickly and efficiently. A banking consultant has noted that the times to complete a transaction are normally distributed with a mean of 34 seconds and a standard deviation of 4 seconds. What percentage of ABM customers take more than 31 seconds to do their banking?(a)
Using the information from the previous question, 90% of bank customers should complete their transactions in less than how many seconds? (b)
Use the information from question 14. Suppose six banking customers are chosen at random. What is the probability that the average time of these six customers is between 32 and 37 seconds?(c)
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