40 students took an exam, the passing score is 70. The mean score of students who passed are 75, the mean score of students who failed are 63, and all the mean of all scores was 72. How many students pass the exam?
40 students took an exam, the passing score is 70. The mean score of students who passed are 75, the mean score of students who failed are 63, and all the mean of all scores was 72. How many students pass the exam?
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter7: Percents
Section: Chapter Questions
Problem 10PTTS
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