BKSB Data and Statistical Interpretation 2 — Questions and Answers
Question 1: A bar chart shows monthly sales: Jan=120, Feb=95, Mar=140, Apr=110. What is the range of these values?
- 45 (Correct answer)
- 40
- 35
- 50
Correct answer: 45
Range = highest minus lowest = 140 − 95 = 45.
Question 2: A pie chart shows that 25% of students prefer science. If there are 200 students total, how many prefer science?
- 50 (Correct answer)
- 25
- 40
- 75
Correct answer: 50
25% of 200 = 0.25 × 200 = 50 students.
Question 3: A line graph shows temperatures rising from 10°C to 22°C over 6 days. What is the average daily increase?
- 2°C (Correct answer)
- 3°C
- 1.5°C
- 4°C
Correct answer: 2°C
Total increase = 22 − 10 = 12°C over 6 days, so average = 12 ÷ 6 = 2°C per day.
Question 4: The following data set shows ages: 14, 16, 18, 20, 22, 24, 26. What is the median age?
- 20 (Correct answer)
- 18
- 22
- 19
Correct answer: 20
With 7 ordered values, the median is the 4th value = 20.
Question 5: A frequency table shows 5 students scored 60, 8 scored 70, and 7 scored 80. What is the modal score?
- 70 (Correct answer)
- 60
- 80
- 75
Correct answer: 70
The mode is the score that appears most frequently — 70 was scored by 8 students.
Question 6: A scatter graph shows a strong positive correlation between study hours and test scores. What does this mean?
- As study hours increase, test scores tend to increase (Correct answer)
- As study hours increase, test scores tend to decrease
- Study hours and test scores are unrelated
- Test scores are always high regardless of study hours
Correct answer: As study hours increase, test scores tend to increase
A positive correlation means both variables tend to increase together.
Question 7: A tally chart records favorite colors. Red has 12 tallies, Blue has 18, Green has 9, Yellow has 6. What percentage chose Blue?
- 40% (Correct answer)
- 36%
- 45%
- 30%
Correct answer: 40%
Total = 12+18+9+6 = 45; Blue percentage = 18/45 × 100 = 40%.
BKSB Data and Statistical Interpretation 2
A bar chart shows monthly sales: Jan=120, Feb=95, Mar=140, Apr=110.
What is the range of these values?