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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:

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(a)  above 1.8 seconds?

(b)  between 1.5 and 2.5 seconds?

(a) P(x &gt; 1.8) = 0.6554 (b)... View the full answer

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

• 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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