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Suppose 120 students took a physics exam and their results are organized in the following relative frequency distribution

/in /by

1. Suppose 120 students took a physics exam and their results
are organized in the following relative frequency distribution:

Grade Relative Frequency
< 50 10%
50-59 15%
60-69 20%
70-79 25%
80-89 20%
90-100 10%
Find the number of students who received at least 70 on the exam. Must show appropriate work for full credit.

 
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