GAT Mathematics and Numeracy 2 — Questions and Answers
Question 1: In a class of 40 students, 16 are boys. What percentage of the class are girls?
- 40%
- 60% (Correct answer)
- 24%
- 55%
Correct answer: 60%
Girls = 40 − 16 = 24; percentage = 24/40 × 100 = 60%.
Question 2: What is the mean of the values 4, 8, 12, 6, 10?
- 6
- 8 (Correct answer)
- 10
- 12
Correct answer: 8
Mean = (4 + 8 + 12 + 6 + 10) ÷ 5 = 40 ÷ 5 = 8.
Question 3: A bag contains 4 red, 6 blue, and 2 green balls. What is the probability of randomly selecting a green ball?
- 1/4
- 1/6 (Correct answer)
- 1/3
- 2/3
Correct answer: 1/6
Probability = 2 ÷ (4 + 6 + 2) = 2/12 = 1/6.
Question 4: What is the range of the data set: 12, 5, 19, 8, 23?
- 15
- 18 (Correct answer)
- 11
- 23
Correct answer: 18
Range = Maximum − Minimum = 23 − 5 = 18.
Question 5: Which measure of central tendency is most affected by extreme outlier values?
- Median
- Mean (Correct answer)
- Mode
- Range
Correct answer: Mean
The mean uses the actual numerical value of every data point, so extreme values can significantly skew it.
Question 6: A store sells 25 items at $8 each and 15 items at $12 each. What is the total revenue?
- $380 (Correct answer)
- $260
- $340
- $480
Correct answer: $380
Total = (25 × $8) + (15 × $12) = $200 + $180 = $380.
Question 7: If sales increased from $50,000 to $65,000, what is the percentage increase?
- 15%
- 30% (Correct answer)
- 25%
- 20%
Correct answer: 30%
Percentage increase = (65,000 − 50,000) / 50,000 × 100 = 15,000 / 50,000 × 100 = 30%.
GAT Mathematics and Numeracy 2
In a class of 40 students, 16 are boys.
What percentage of the class are girls?