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Suppose that the mean download time for a commercial tax preparation site is 2.0 seconds. Suppose that the download time is normally distributed,...

Suppose that the mean download time for a commercial tax preparation site is 2.0 seconds. Suppose that the download time is normally distributed, with a standard deviation of 0.5 second. What is the probability that a download time is:



(a)  above 1.8 seconds?

(b)  between 1.5 and 2.5 seconds?

(c)  99% of the download times are slower (a higher number of seconds   taken to download) than how many seconds?

Top Answer

(a) P(x > 1.8) = 0.6554 (b)... View the full answer

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Other Answers

(a) mean = 2secs standard deviation = 0.5 secs For x = 1.8, z = (1.8-2)/0.5 = -0.4 p(x>1.8)=p(z>-0.4) =... View the full answer

3 comments
  • sorry, for (b), we will have p(1.5
    • ashok592000
    • May 01, 2018 at 8:06am
  • sorry, for (b), we will have p(1.5
    • ashok592000
    • May 01, 2018 at 8:07am
  • kindly ignore this answer as (b) is incorrect. I considered x =1.8 but it should have been x = 1.5.
    • ashok592000
    • May 01, 2018 at 8:08am

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