The distribution of weights on 9-ounce bags of potato chips is approximately normal with a mean of 9.12 ounces and a standard deviation of 0.15 ounce. What is the range of weights for 95% of the bags?
Let X be the weight of bags of potato chips
Then
From z table we find that
For z = -1.96 , X = -1.96*0.15 + 9.12 = 8.826
For z = 1.96, X = 1.96 * 0.15 + 9.12 = 9.414
95% of the bags is between 8.83 ounce and 9.41 ounce
The distribution of weights on 9-ounce bags of potato chips is approximately normal with a mean o...
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