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The weight of the packages is normally distributed with mean equal to 20 lb. and standard...

The weight of the packages is normally distributed with mean equal to 20 lb. and standard deviation of 2 lb.

a) what percent of the packages will weigh between 18 and 21 lb.

b)What percent of the packages will weigh less than 19 lb.
c) what percent of the packages will weigh more than 25 lb.
d) what is the weight, separating bottom 80% of packages from top 20%
Math   Statistics-And-Probability   
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