The mean of 5 numbers is 20. If one number 20 is excluded, what is the new mean of the remaining 4?
A15
B18
C20
D22
Explanation
Total = 5 * 20 = 100. New total = 100 – 20 = 80. New mean = 80 / 4 = 20.
Exam Relevance
- Topic: Statistics
- Subtopic: Mean
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