Class of 25 student took a science test 10 students had n average score 80 the other students had n average score of 60. what is the average score of the whole class?
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Answer:
Total marks of 10 student with average 80 = 80x 10800
total marks of 15 students with average 60 =
60 x 15 900 Average score of whole class = 800 +
900 = 1700/25 = 68
25
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