FAST-NU Basic Mathematics — Averages
Averages is part of the Basic Mathematics section of FAST's BS CS/Engineering admission test (usually 20 of the 120 MCQs, 20% of the marks). It breaks into 2 subtopics, and we hold 47 FAST-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (2)
How Averages is tested
Across the 7 FAST-pattern papers on ParhaiKrlo, Averages accounts for 14 questions. It appears in all 7, about 2 questions a paper. The heaviest was FAST Past Paper 07, with 2 questions.
| Paper | Questions |
|---|---|
| FAST Past Paper 07 | 2 |
| FAST Past Paper 06 | 2 |
| FAST Past Paper 05 | 2 |
| FAST Past Paper 04 | 2 |
| FAST Past Paper 03 | 2 |
| FAST Past Paper 02 | 2 |
| FAST Past Paper 01 | 2 |
Averages MCQs from the FAST-pattern papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · FAST Past Paper 07 · Averages
The average of a set of numbers always lies:
- A.between the smallest and the largest values
- B.above the largest value
- C.below the smallest value
- D.at exactly zero
Show answer
Answer: A. between the smallest and the largest values — An average can never be bigger than the biggest value or smaller than the smallest.
- Q2 · FAST Past Paper 06 · Averages
The mean of 12, 15, 18, x and 20 is 17. The value of x is:
- A.17
- B.20
- C.18
- D.22
Show answer
Answer: B. 20 — Total = 5 × 17 = 85; the known numbers add to 65, so x = 20.
- Q3 · FAST Past Paper 05 · Averages
A student scores 60%, 70% and 80% in three tests. The tests carry weights 1, 2 and 2 respectively. The student's weighted average is:
- A.70%
- B.71%
- C.74%
- D.72%
Show answer
Answer: D. 72% — Weighted average = (1 × 60 + 2 × 70 + 2 × 80)/(1 + 2 + 2) = 360/5 = 72%.