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The breaking strength of plastic bags used for packing produce us normally distributed with a mean of 5 pounds per

Question:

the breaking strength of plastic bags used for packing produce us normally distributed with a mean of 5 pounds per square inch and a standard deviation od 1.5 per square inch. what proportion of the bags gave a breaking strength of
a) less than 3.17 pounds per square inch
b)at least 3.6 pounds per square inch
c) between 5 and 5.5 pounds per square inch
d) between what two values symetricallyy distributed around the mean will 95% of the breaking strengths fall?

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