1) The breaking strength of plastic bags used for packaging produce is normally distributed, with a mean of 5 pounds per square inch and a
standard deviation of 1.5 pounds per square inch. What proportion of the bags have a breaking strength of a. lessthan 3.17 pounds per square inch? b. atleast 3.6 pounds per square inch? c. between 5 and 5.5 pounds per square inch? d. 95% of the breaking strengths will be contained between what two values symmetrically distributed around the mean1A_ 2) Based on past data, the sample mean of the credit card purchases at a large department store is $35. Assuming sample size is 25 and the
population standard deviation is 10.
a) What % of samples are likely to have between 20 and 30? b) Between what two values 90% of sample means fall?
c) Below what value 99% of sample means fall? d) Above what value only 1% of sample means fall??
Within what symmetrical limits of the population percentage will 95% of the sample percentages fall? 3) The inspection division of the Lee County Weights and Measures Department is interested in estimating the actual amount of soft drink
that is placed in 2-liter bottles at the local bottling plant of a large nationally known soft-drink company. The bottling plant has informed the inspection division that the standard deviation for 2-liter bottles is .03 liter. A random sample of 49 bottles obtained from this hauling plant
indicated a sample average of 1.99 liters. Set up a 95% confidence interval estimate of the true average amount of soft drink in each bottle. Formula Critical Values C.I.E.

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