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chapter 7, Basic Statistics

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A study of long term phone calls made from general electricss corporate headquarters in fairfeild, conneticuit, revealed the length of the calls, in minutes follows the normal probability distribution. the mean length of time per call was 4.2 minutes and the standard deviation was .60 minutes.
a. what fraction of calls last between 4.2 and 5 minutes
B. what fraction of calls last more than 5 minutes
C. what fraction of the calls last between 5 and 6 minutes
D. what fraction of the calls last between 4 and 6 minutes
E. as part of her report to the president the director of communications would like to report the length of the longest 4% of calls what is the time

The funds dispersed at the atm machine located near the checkout line at the krogers in union kentucky follows normal probability distribution with a mean of 4200 per day and a standard deviation of 720 per day. The machine is programmed to notify the nearby bank if the amount is very low( less than 2500) or very high( more than 6000)
A. what percent of the days will the bank be notified because the amount dispensed is very low
B. what is the percent of time will the bank be notified because the amount dispensed is to high
C. what perfcent of the time will the bank not be notified regarding the amount dispersed

The price of shares of bank of florida at the end of trading each day for the last year followed the normal distribution. Assume there were 240 trading days in the year. The mean price was 42.00 per share and the standard deviation was 2.25 per share
A. what percent of the days was the price over 45.00, How many days would you estimate
B. What percent of days was the price between 38 and 40
C. what was the stock price on the highest 15% days

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