<PRE><B>Question 232294</B>
Question: 70 students got an average score of 80, 30 students got an average score of 70. What is the average score of all students? Please explain how you calculate.
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Average = total number of points/total number of students
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Total # of points = 70*80 + 30*70 =7700
Total # of students = 70 + 30 = 100
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Average for all the students = 7700/100 = 77
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Cheers,
Stan H. </PRE>