Average

1. Consider the first three numbers: 17, 26, 20. Calculate their average:
   Average = (17 + 26 + 20) / 3 = 63 / 3 = 21.
2. Consider the next three numbers: 26, 20, 35. Calculate their average:
   Average = (26 + 20 + 35) / 3 = 81 / 3 = 27.
3. Consider the last three numbers: 20, 35, 44. Calculate their average:
   Average = (20 + 35 + 44) / 3 = 99 / 3 = 33.

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1. List the first five natural numbers: .
2. Calculate the square of each number:
3. Sum the squares: .
4. Calculate the average by dividing the sum of squares by the number of terms: .

To solve the problem of determining which 4-year moving averages will be computed from the sales data , we must understand the concept of a 4-year moving average. Here, it's calculated by taking the average of sales figures over 4 consecutive years. We proceed with computing the averages as follows:

The first average is for the years 1 to 4: .

The second average is for the years 2 to 5: .

The third average is for the years 3 to 6: .

The fourth average is for the years 4 to 7: .

The fifth average is for the years 5 to 8: .

Comparing these with the given choices:

• (A) : Correct, as it corresponds to the first average.
• (B) : Incorrect, does not correspond to any of the computed averages.
• (C) : Incorrect, does not correspond to any of the computed averages.
• (D) : Correct, as it corresponds to the second average.

Thus, the correct options are:

(A) and (D) only