Suppose that the mean time to download a home page of a website is 1.2 seconds. Given that the download time is normally distributed, with a standard deviation of 0.2 second. What is the probability that a download time is:
(a) less than 2 seconds? (4 d.p.)
Prob =
(b) between 1.5 and 2.5 seconds? (4 d.p.)
Prob =
(c) above 1.8 seconds? (4 d.p.)
Prob =
(d) 99% of the download times are slower (higher) than how many seconds? (3 d.p.)
Number of seconds =
(e) 95% of the download times are between what two values, symmetrically distributed around the mean? (3 d.p.)
lower bound =
upper bound =