Asked by rwedf

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%
d.99.7%​
Answered by R_scott
approximately 95% of a normally distributed population
... lies within 2 s.d. of the mean
Answered by Reiny
Perfectly suited for David's applet
http://davidmlane.com/normal.html
Answered by Jay
C. Approximately 95%
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