What is the average salary (in thousand per month) in the age group 40 - 50…
2015
What is the average salary (in thousand per month) in the age group 40 - 50 years ?
Answer: B. 42.5 — ConceptFor a subgroup average, first filter the records using the stated boundary conditions. Then add the selected values and divide by the number of…
- A.
35
- B.
42.5
- C.
40.5
- D.
36.5
Show answer & explanation
Correct answer: B
Concept
For a subgroup average, first filter the records using the stated boundary conditions.
Then add the selected values and divide by the number of selected records: average = sum of selected salaries ÷ number of selected employees.
Application
The interval 40–50 years is inclusive, so the selected age–salary pairs are:
Age (years) | Salary (thousand rupees per month) |
|---|---|
44 | 35 |
42 | 35 |
42 | 50 |
41 | 30 |
44 | 45 |
49 | 50 |
43 | 45 |
45 | 50 |
The selected salaries are 35, 35, 50, 30, 45, 50, 45 and 50.
Their sum is 35 + 35 + 50 + 30 + 45 + 50 + 45 + 50 = 340.
There are 8 selected employees, so the average is 340 ÷ 8 = 42.5.
Cross-check
Multiplying the computed average by the number of selected employees gives 42.5 × 8 = 340, which matches the salary total.
Result
Therefore, the average salary for the 40–50 years age group is 42.5 thousand rupees per month.