Normal Probability: H&R Block Website Download Time
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An article reported that the mean time to download the home page for the Internal Revenue Service, www.irs.gov, is 0.8 seconds. Suppose that the download time is normal distributed, with a standard deviation of 0.2 seconds.
The same artile mentioned above also reported that the mean time to download the home page for H & R Block, www.hrblock.com, is 2.5 seconds. Suppose that the download time is normal distributed, with a standard deviation of 0..5 seconds. What is the probability that a download time is:
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 downloard times?
e) Compare the results fror the IRS site computed in Problem 6.52 to those of the H & R Block site.
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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.
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