A manufacturing company produces electric insulators. If the insulators break when in use, a short circuit is likely to occur. To test the strength of the insulators, destructive testing in high-powered labs is carried out to determine how much force is required to break the insulators. Force is measured by observing how many pounds must be applied to the insulator before it breaks. Data are collected from a sample of 30 insulators. The strengths are as follows. Complete parts a through c. 1,566 1,784 1,395 1,713 1,746 1,422 1,424 1,559 1,513 1,720 1,731 1,558 1,747 1,342 1,585 1,560 1,758 1,643 1,596 1,712 1,703 1,436 1,591 1,643 1,791 1,659 1,743 1,724 1,598 1,595 a. Construct a frequency distribution. Strength Frequency 1,300 but less than 1,400 1,400 but less than 1,500 1,500 but less than 1,600 1,600 but less than 1,700 1,700 but less than 1,800