Use o;f the normal curve table Biddle Keg Company uses white oak lumber to manufacture brandy barrels. Management believes that in the past it has had too much invested in its inventory of lumber and wants to develop some data that may help to manage the lumber inventory. From a random sample of weekly lumber use, the company determines that mean weekly use is 900 board feet of white oak with a standard deviation of 100 feet. Management believes that lumber use is approximated by a normal distribution.

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REQUIRED a. Compute the range of lumber use for 95 percent of the weeks. b. Find the probability that lumber use will be between 800 and 1,000 board feet. c. Determine the probability that lumber use will be less than 800 board feet per week.