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Mean
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NTPC Graduate Tier 1 2025 Shift-1 📅 09 Jun, 2025

The arithmetic mean of the observations 79, 92, 39, 57, 91, 28, 74, 90 and 44 is:

A
59
B
61
C
66
D
71
Result Summary
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NTPC Graduate Tier 1
2025 • 09 Jun, 2025 • Shift-1
The arithmetic mean of the observations 79, 92, 39, 57, 91, 28, 74, 90 and 44 is:
Correct Answer
66
Algorithmic Summation: The absolute first step in deriving a statistical mean is combining all individual data points into a single, unified total sum. We seque......
Ref/Book : NTPC Graduate Tier 1 2025
Ref. Subject Statistics
Chapter -
Ref. Topic Mean
Pg. No -
💡 Analysis & Explanation
Algorithmic Summation ▼
The absolute first step in deriving a statistical mean is combining all individual data points into a single, unified total sum. We sequentially add the provided array: 79 + 92 = 171. 171 + 39 = 210. 210 + 57 = 267. 267 + 91 = 358. 358 + 28 = 386. 386 + 74 = 460. 460 + 90 = 550. 550 + 44 = 594. The grand total of all observations stands exactly at 594.
Counting Observations (N) ▼
We must tally the physical count of numbers listed in the dataset. A careful manual count reveals exactly 9 distinct numerical entries.
Applying the Mean Formula ▼
The foundational rule of averages mandates dividing the gross total sum by the observation count. We set up the division: 594 / 9.
Final Derivation ▼
Executing the division strictly yields 66 (since 9 * 60 = 540, and 9 * 6 = 54; 540 + 54 = 594).
Conclusion ▼
The perfectly calculated arithmetic mean for this set is 66.
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