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The mean of 4 numbers is 20. If a 5th number 30 is added, find the new mean:
A20
B22
C24
D25
Answer & Solution
Correct answer: B. 22
Sum of 4 = 4 × 20 = 80. New sum = 80 + 30 = 110. New mean = 110/5 = 22.
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