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Home › GRE › GRE Quant - Averages and Statistics

GRE Quant - Averages and Statistics — GRE Questions & Practice

Practise 277 GRE Quant - Averages and Statistics questions from GRE for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.

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Practice questions on GRE Quant - Averages and Statistics — with answers

Try each question first, then open the answer. Explanations are included.

1. A class has 7 students with an average score of 70 and another class has 21 students with an average score of 85. What is the combined average score of both classes?

  1. A72.7
  2. B81.25
  3. C74.95
  4. D80
Show answer

Answer: B

Combined average = (n1*a1 + n2*a2)/(n1+n2) = (7x70 + 21x85)/(7+21) = 81.25.

2. A class has 7 students with an average score of 50 and another class has 19 students with an average score of 90. What is the combined average score of both classes?

  1. A79.23
  2. B81.23
  3. C65.42
  4. D84.23
Show answer

Answer: A

Combined average = (n1*a1 + n2*a2)/(n1+n2) = (7x50 + 19x90)/(7+19) = 79.23.

3. A class has 5 students with an average score of 40 and another class has 19 students with an average score of 95. What is the combined average score of both classes?

  1. A83.54
  2. B88.54
  3. C98.48
  4. D84.04
Show answer

Answer: A

Combined average = (n1*a1 + n2*a2)/(n1+n2) = (5x40 + 19x95)/(5+19) = 83.54.

4. Find the average of the following 8 numbers: 30, 33, 42, 42, 42, 45, 78, 65.

  1. A50.22
  2. B48.57
  3. C47.12
  4. D49.12
Show answer

Answer: C

Average = Sum of numbers / Count = 377 / 8 = 47.12.

5. A class has 9 students with an average score of 70 and another class has 27 students with an average score of 85. What is the combined average score of both classes?

  1. A81.25
  2. B68.31
  3. C82.25
  4. D69.24
Show answer

Answer: A

Combined average = (n1*a1 + n2*a2)/(n1+n2) = (9x70 + 27x85)/(9+27) = 81.25.

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