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It takes an average of 10 seconds to download a certain file. If the standard deviation is known = 1.5 seconds, what is the probability

It takes an average of 10 seconds to download a certain file. If the standard deviation is known = 1.5 seconds, what is the probability that a certain file will take between 4.75 and 15.25 seconds to download?

91.8%

86.7%

8.2%

44.4%

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