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A quantitative data set has been grouped by using limit grouping with equal-width classes.

The lower and upper limits of the first class are $3$and $8$.

The class width is$6$.

The average of the lower and upper bounds is the class mark.

Calculation: The lower limit for second class is $9$and the top limit is $14.$

The second class will have a class size of

$=\frac{9+14}{2}$

$=11.5$

A quantitative data set has been grouped by using limit grouping with equal-width classes.

The lower and upper limits of the first class are $3$and $8$.

The class width is 6.

A class's lower class limit is the smallest data value that can be stored in the class.

The lower limit is one higher than the second class's upper limit, and the upper limit is the preceding class's upper limit multiplied by the class width.

A quantitative data set has been grouped by using limit grouping with equal-width classes.

The lower and upper limits of the first class are $3$and $8$respectively.

The class width is $6$.

A class's lower class limit is the smallest data value that can be stored in the class.

Because the observation of $23$does not fall within the third class's bottom and higher bounds, it is placed in the fourth class.