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What was the average number of correct answers from each of the last 30 people only?

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30 people were given 10 quiz questions, they correctly answered an average of only three each.

After a further 30 people had answered the quiz, the average number of correct answers rose to six per person.

What was the average number of correct answers from each of the last 30 people only?

posted Mar 10, 2016 by Kapil Kapoor

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2 Answers

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30 * 3 = 90 questions answered correctly by the first group of 30 people
60 * 6 = 360 questions answered correctly by the two groups of 30 people each
Then the second group of 30 people answered correctly : 360 - 90 = 270 questions
Therefore the average number for the second group of 30 people will be : 270/ 30 = 9

answer Mar 12, 2016 by anonymous
–1 vote

The average number of correct answers will be four per person.

answer Mar 10, 2016 by Ashutosh Kumar Anand



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