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Re: Parts at a factory are packed into shipping containers. The weights o [#permalink]
Solution -

The quantity in Column A is greater.

The values of 43 and 64 fall at one and two standard deviations, respectively, away from the mean. In a normal distribution, approximately 34% of the data falls within one standard deviation above, and another 34% below, the mean. Approximately 14% of the data falls between the first and the second standard deviation on each side of the mean, and approximately 2% of the data is found between the second and third standard deviation marks on each side of the mean. Altogether, across six standard deviations, 2% + 14% + 34% + 34% + 14%+ 2% = 100% of the data. The percentages below 43 (one standard deviation below the mean of 50) are 14% and 2%, or 16%. The percentage above 64 (two standard deviations above the mean) is only 2%. The theoretical normal distribution extends to infinity in both directions, but we must be talking about a reasonably finite number of packages.
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Re: Parts at a factory are packed into shipping containers. The weights o [#permalink]
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