Question 235129
The pretzel pack company advertized that their pretzels weigh 2.5 ounces. 
The weights are normally distributed with mean 2.5 ounces and standard deviation 0.15 ounces. 
For a pretzel pack selected at random find the probabilty that it weighs less than 2.2 ounces and find the probability that it weighs more than 2.8 ounces.
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z(2.2) = (2.2-2.5)/0.15 =-2
z(2.8) = (2.8-2.5)/0.15 = 2
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P(2.2 < x < 2.8) = P(-2 < z < 2) = 0.9545
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Cheers,
Stan H.