BKSB Data and Statistical Interpretation 4

Question 1

A data set has values: 5, 8, 8, 12, 15, 15, 15, 20. Which measure of central tendency best represents this data?

Accepted Answer

Mode

Answer

Mean

Answer

Median

Answer

Range

Question 2

A graph shows company profits over 5 years: $20k, $25k, $18k, $30k, $27k. What was the mean annual profit?

Accepted Answer

$24k

Answer

$25k

Answer

$23k

Answer

$26k

Question 3

A two-way table shows 30 students study French or Spanish in Year 10 or Year 11. 18 study French total, and 16 are in Year 10 total. How many Year 10 students study Spanish if 10 Year 10 students study French?

Accepted Answer

6

Answer

8

Answer

4

Answer

12

Question 4

The heights of 6 plants (cm) are: 12, 15, 11, 18, 14, 16. What is the median height?

Accepted Answer

14.5 cm

Answer

14 cm

Answer

15 cm

Answer

15.5 cm

Question 5

A line graph shows that between March and May, sales dropped from 500 to 350 units. What is the percentage decrease?

Accepted Answer

30%

Answer

25%

Answer

35%

Answer

150%

Question 6

A back-to-back stem-and-leaf plot compares two classes' scores. Class A: 62, 67, 71, 75; Class B: 64, 68, 70, 78. Which class has the higher mean?

Accepted Answer

Class B

Answer

Class A

Answer

They are equal

Answer

Cannot be determined

Question 7

In a histogram, a bar representing the class interval 20–30 has a frequency of 15, and the bar for 30–40 has frequency 25. What fraction of these 40 values falls in the 20–30 interval?

Accepted Answer

3/8

Answer

5/8

Answer

1/2

Answer

2/5