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mean =12quad9,12,15,21,4.

mean =129,12,15,21,4 =12 \quad 9,12,15,21,4 .

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Full solution

Q. mean =129,12,15,21,4 =12 \quad 9,12,15,21,4 .
  1. Calculate sum: Calculate the sum of the numbers. 9+12+15+21+4=619 + 12 + 15 + 21 + 4 = 61
  2. Count terms: Count the number of terms in the sequence.\newlineThere are 55 numbers.
  3. Find mean: Divide the sum by the number of terms to find the mean. 61/5=12.261 / 5 = 12.2

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