For each of the following, determine the interval width that would be best for a grouped frequency

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For each of the following, determine the interval width that would be best for a grouped frequency distribution and identify the approximate number of intervals needed to cover the range of scores.

a. Scores that range from X 5 6 to X 5 81

b. Scores that range from X 5 18 to X 5 34

c. Scores that range from X 5 56 to X 5 97

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