(3) He now has unsorted tabulated data, which are of little value in

their present form. He could rearrange these readings in RANK ORDER; that

is, put them in order of magnitude. Such an arrangement (below) is called

an ARRAY.

The RANGE of the distribution is found by subtracting the lowest value from

the highest value. That is how much the extreme values differ. But since

there are nearly as many different values as there are readings, the data in

this form furnishes little information other than the range.

(4) Before these figures can be graphed, they must first be grouped.

In order to see how densely the readings cluster about any given point, an

interval must be selected and the number of readings falling within that

interval must be counted (sometimes called class intervals) so that each

point falls at the midpoint of the interval.

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