Five salaries are Rs. 8000, Rs. 5000, Rs. 11000, Rs. 7000, and Rs. 9000 per month. What is the average monthly salary?

Introduction / Context:
Average salary problems are straightforward applications of the arithmetic mean. Careful summation ensures accuracy when some values are above and some below the final average.

Given Data / Assumptions:

• Salaries (per month): 8000, 5000, 11000, 7000, 9000 (in rupees)
• Number of people: 5

Concept / Approach:
Average = (sum of all salaries) / 5. Adding in balanced pairs reduces addition mistakes.

Step-by-Step Solution:

Verification / Alternative check:
Check spread around 8000: values are 5000 (−3000), 7000 (−1000), 8000 (0), 9000 (+1000), 11000 (+3000). Offsets sum to zero, confirming 8000 is the mean.

Why Other Options Are Wrong:

• Rs. 7000 and Rs. 9000: Too low/high relative to balanced offsets.
• Rs. 8500: Not supported by the exact arithmetic; suggests rounding error.
• None of these: A correct exact value exists.

Common Pitfalls:
Arithmetic slips when several terms require addition; forgetting to divide by the correct count of individuals.

Final Answer:
Rs. 8000