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A person has decided to construct a frequency distribution for a set of data containing 60 numbers. The lowest number is 23 and the highest number is 68. If 7 classes are used, the class width should be approximately _______.a) 5b) 7c) 9d) 11e) 12

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Answer: The correct answer is b) 7

Explanation: Class width refers to the difference between highest and lowest number divided by the number of classes.

In calculating class width, the range of the frequency distribution is first calculated before it is divided by the number of classes.

Therefore, Range = Highest number - Lowest number = 68 - 23 = 45

Class width = Range / Number of classes

= 45 / 7

= 6.428

In rounding up to the nearest whole number it becomes 7.