2) The breaking strength of plastic bags used for packaging produce is normally distributed, with a mean of 7.5 pounds per square inch and a standard deviation of 2.8 pounds per square inch. What proportion of the bags have a breaking strength of a. Less than 3.17 pounds per square inch? c. Between 5 and 5 pounds per square inch? b. At least 5 pounds per square inch? d. 98% of the breaking strengths will be between what two values symmetrically distributed around the mean? f. Between what two values 99% of bags fall e. Below what value 90% of plastic bags fall