20 students

Twenty students took a test. Ten students got an average (arithmetic mean) score of 80. Five of them got an average score of 75. And the remaining 5 students got an average score of 55. What is the average score of the 20 students?

Correct answer:

m =  69.75

Step-by-step explanation:

n=20  m=n10 80+5 75+4 55=2010 80+5 75+4 55=69.75

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