The number of pieces of popcorn in a large movie theatre popcorn bucket is normally distributed, with a mean of 1720 and a standard deviation of 20. Approximately what percentage of buckets contain between 1680 and 1760 pieces of popcorn?
a.approximately 68%
b.approximately 75%
c.approximately 95%

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  1. approximately 95% of a normally distributed population
    ... lies within 2 s.d. of the mean

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  2. Perfectly suited for David's applet

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  3. C. Approximately 95%

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