You find the the smallest and largest values. The interval is the largest minus the smallest.
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to find an interval you have to subtract the first two number from each other for example 5 10 15 20 the interval for this set of data is 5
What is the convenient scale and interval to use for graphing each set of data set?
In principle, yes. It may require interpolation within the central interval.
A frequency diagram.
To write an interval for the given data set, we need to find the range, which is the difference between the maximum and minimum values. The maximum value is 98 and the minimum value is 7, so the range is 98 - 7 = 91. An interval could be [0-100) since it covers the range from 0 to 100 but excludes 100. To find the scale, we need to determine the intervals between the data points. The scale could be 10 units per division, as this would evenly space out the data points and make it easier to visualize the distribution of the data.