Answer
20
Work Step by Step
Using interval size 20 will give less intervals and will show little variation with test scores.
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 12 - Data Analysis and Probability - 12-2 Frequency and Histograms - Practice and Problem-Solving Exercises - Page 724: 26
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