The average of 11 numbers is 50. If the first six numbers have an average of 49 and the last six numbers have an average of 52, find the middle number.
A.56✓ Correct
B.50
C.47
D.53
Explanation
Total of 11 numbers = 550. Sum of first 6 = 294. Sum of last 6 = 312. Middle number (7th) = 294 + 312 − 550 = 56.
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