BKSB Data and Statistical Interpretation 3

Question 1

The mean of five numbers is 14. Four of the numbers are 10, 12, 16, and 18. What is the fifth number?

Accepted Answer

14

Answer

12

Answer

16

Answer

10

Question 2

A dual bar chart compares male and female test results. Males averaged 72 and females averaged 68. What is the combined average if there are equal numbers of each?

Accepted Answer

70

Answer

72

Answer

68

Answer

71

Question 3

A cumulative frequency graph shows that 60 out of 100 students scored below 55 marks. What is the probability that a randomly selected student scored 55 or above?

Accepted Answer

0.4

Answer

0.6

Answer

0.55

Answer

0.45

Question 4

In a data set, the lower quartile is 20 and the upper quartile is 40. What is the interquartile range (IQR)?

Accepted Answer

20

Answer

30

Answer

60

Answer

10

Question 5

A pictogram uses one symbol to represent 4 people. A category shows 6 full symbols and one half symbol. How many people does this represent?

Accepted Answer

26

Answer

24

Answer

28

Answer

25

Question 6

A survey of 80 people found 60% own a car. How many people in the survey do NOT own a car?

Accepted Answer

32

Answer

48

Answer

60

Answer

20

Question 7

A stem-and-leaf diagram shows stems 2, 3, 4 with leaves: 2|3,5,7 and 3|1,4,6,9 and 4|2,5. Which stem has the most data values?

Accepted Answer

3

Answer

2

Answer

4

Answer

They are equal