dunk36
08.04.2021 •
Mathematics
According to the following graph, which service took the longest to download the podcast? How much longer did it take than Jackrabbit in minutes and seconds? 51000711 The service will take the longest to download the podcast. It will take minutes and seconds longer than Jackrabbit
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Ответ:
The empirical rule states for a normal distribution:
68% of the data are within ± 1 standard deviation from the mean
95% of the data are within ± 2 standard deviations from the mean
99.7% of the data are within ± 3 standard deviations from the mean
A normal distribution is also symmetric around its mean. Since that's the case, 34% (1/2 of 68) would be within +1 standard deviation from the mean and 34% would be within -1 standard deviation from the mean
This problem asks what is the percentage between 53 and 65 when the mean is 62 and the standard deviation is 3. Putting this in terms of the mean and standard deviations, this problem asks what is the percentage between -3 and + 1 standard deviations?
The percentage between the mean and -3 standard deviations is 49.85% (this is one half of 99.7%)
The percentage between the mean and +1 standard deviations is 34% (one half of 68%)
Add those two together to get your total percentage