alleryThe mean of 10, 20 and 30 is 20. After adding 40 to the data, the mean is?
A25
B30
C100
D20
Answer & Solution
Correct answer: A. 25
1. New sum = 10 + 20 + 30 + 40 = 100.
2. New count = 4.
3. 100 / 4 = 25.
_Source: Wikipedia, Average (CC BY-SA 4.0), Average_
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