Question 9: Maya, Madhura and Mohsina are friends studying in the same class. In a class test in geography, Maya got 16 out of 25. Madhura got 20. Their average score was 19. How much did Mohsina score? 20 21 25 27
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Answer:
Mean = Sum of observations / Number of observations
Let Mohsina's score be x
Mean = 16 + 20 + x / 3
19 = 36 + x / 3
57 = 36 + x
x = 57 - 36 = 21
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