Suppose 120 students took a physics exam and their results are organized i
Suppose 120 students took a physics exam and their results are organized
in the following relative frequency distribution:
Grade < 50 50-59 60-69 70-79 80-89 90-100
Relative Frequency 10% 15% 20% 25% 20% 10%
Find the number of students who received at least 70 on the exam
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