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    Normal Probability: HR Block Web site

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    An article reported that (l.j. Flynn, Tax Surfing the New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal revenue service, www.irs.gov, is 0.8 seconds. The same article also reported that the mean download time for the H&R Block Website, www.hrblock.com, is 2.5 seconds. Supoose that the download time is normally distributed, with a standard deviation of 0.5 seconds. What is the probability that a download time is

    Use the normal probability file attached and show work

    A. Less than 1 second

    B. between 0.5 and 1.5 seconds

    C. above 0.5 seconds

    D. Above how many seconds are 99% of the download times?

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    Solution Summary

    The solution provides step by step method for the calculation of probability using the Z score. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.