The average of 15 numbers is 40. If 56 and 24 are discarded from this set, what is the average of the remaining numbers?
Explanation:
Sum of 15 numbers = 15 × 40 = 600
After discarding 56 and 24, sum of remaining 13 numbers = 600 – 56 – 24 = 520
⇒ Average of remaining 13 numbers = 520/13 = 40
Hence, option (a).
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