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⤴️ Represent the upper numbers on the number line ⤴️
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Option D)
Mean of 15 of them is 18 and mean of remaining is 13.
Mean of 25 numbers.
Mean of 15 of them is 18.
Sum of 15 numbers = 15 * 18 = 270.
Mean of remaining numbers is 13.
Remaining numbers = 25 - 15 = 10.
Sum of 10 numbers = 13 * 10 = 130.
Total = 270 + 130 = 400.
Mean of 25 numbers = 400/25 = 16.
Mean of 25 numbers is 16
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