2021 QCAA Multiple Choice

The second smoothed value for the 3-point moving average is

• 32

• 25

• 20

• 18

How many faces does this planar graph have?

• 3

• 4

• 5

• 7

The table shows the results of a student survey about their preferred movie genre.

Of the students who preferred comedy, what percentage were in Year 9 or higher?

• 25%

• 30%

• 60%

• 75%

A confounding variable is a variable that

• can only take on a certain number of values.

• remains constant throughout a statistical investigation.

• is used to predict a difference in the response variable.

• other than the explanatory variable, influences the response variable.

The coach of a four-person relay team is deciding on the order of the runners. Use the bipartite graph to determine which statement is correct.

• Linh should be the first runner.

• Simon should be the second runner.

• Ivan should be the third runner.

• Balal should be the fourth runner.

These scatterplots show the number of high-rises in a city and their distance from the city centre. Which scatterplot was used to extrapolate that 25 km from the city centre there were 20 high-rises?

• A

• B

• C

• D

Which cut (C₁, C₂, C₃ or C₄) could be used to determine the maximum flow from the source to the sink in this network?

• C₁

• C₂

• C₃

• C₄

A basketball competition has six teams that have completed three rounds of competition as shown.

The graph to represent this information has

• 6 edges.

• 9 edges.

• 15 edges.

• 18 edges.

A staircase is to be extended by installing n additional stairs. Each stair is 25 cm high. If the existing staircase reaches 1.2 m off the ground, which rule models the total height the stairs will reach in centimetres?

City A is located at 55° N, 120° E and City B is located at 40° N, 165° E. The sun will rise in City A approximately

• 1 hour before it rises in City B.

• 1 hour after it rises in City B.

• 3 hours before it rises in City B.

• 3 hours after it rises in City B.