Please answer and explain

2) The breaking strength of plastic bags used for packaging produce is normally distributed, with a mean of 7 pounds per square inch and a standard deviation of 2.5 pounds per square inch. What proportion of the bags have a breaking strength of a. less than 4.17 pounds per square inch? b. at least 5.6 pounds per square inch? c. between 5 and 5.5 pounds per square inch? (1. 95% of the breaking strengths will be between what two values symmetrically distributed around the mean? e. less than 3.6 or more than 6.4 f. less than 5 and less than 3.6