BKSB Data and Statistical Interpretation 5

Question 1

A frequency distribution table shows ages 20–29 (freq 8), 30–39 (freq 14), 40–49 (freq 10), 50–59 (freq 8). Which class interval is the modal class?

Accepted Answer

30–39

Answer

20–29

Answer

40–49

Answer

50–59

Question 2

A survey asks 150 people about their exercise habits. Results shown in a pie chart: 'Daily' = 90°. How many people exercise daily?

Accepted Answer

37.5

Answer

45

Answer

30

Answer

60

Question 3

A box plot shows: minimum = 10, lower quartile = 20, median = 30, upper quartile = 45, maximum = 60. What is the interquartile range?

Accepted Answer

25

Answer

30

Answer

50

Answer

20

Question 4

A time series graph shows weekly website visits: Week 1=200, Week 2=250, Week 3=230, Week 4=280, Week 5=310. What is the trend?

Accepted Answer

Generally increasing

Answer

Generally decreasing

Answer

No clear trend

Answer

Constant

Question 5

A grouped frequency table has total frequency 60. The relative frequency of one class is 0.25. How many values are in that class?

Accepted Answer

15

Answer

25

Answer

12

Answer

20

Question 6

Two data sets have the same mean of 50. Set A has a range of 10 and Set B has a range of 40. What can you conclude?

Accepted Answer

Set B has more spread/variation than Set A

Answer

Set A has more spread than Set B

Answer

Both sets are identical

Answer

Set B has a higher median than Set A

Question 7

A comparative bar chart shows that in 2023, Product X sold 480 units and Product Y sold 320 units. What is the ratio of X to Y sales in simplest form?

Accepted Answer

3:2

Answer

4:3

Answer

2:1

Answer

5:3