The class interval size of the frequency distribution of the weights of classmates is 9.
The class interval's size is equal to the distance between the midpoints of two successive numbers.
137 - 128 = 9
146 - 137 = 9
Therefore,
The size of the class interval is 9.
The smallest and greatest data values that fall into each class in a frequency distribution are represented by the class limit.
In a class with marks between 128 - 137,
The lower limit is 128 and the upper limit is 137
In a class with weights between 137 - 146,
The lower limit is 137 and the upper limit is 146
In a class with weights between 146- 155,
The lower limit is 146 and the upper limit is 155
In a class with weights between 155 - 164,
The lower limit is 155 and the upper limit is 164
Class with weights between 164 - 173,
The lower limit is 164 and the upper limit is 173
In a class with weights between 173 - 182,
The lower limit is 173 and the upper limit is 182
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