Comp Sci Unit 3 #11

Consider a game in which a player flips a fair coin three times. If all three coin flips have the same result (either all heads or all tails) the player wins. Otherwise, the player loses.

Which of the following code segments best simulates the behavior of the game?

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In a certain science experiment, 75 percent of trials are expected to be successful and 25 percent of trials are expected to be unsuccessful. The program below is intended to simulate the results of repeated trials of the experiment.

Which of the following can be used to replace <Missing Code> so that the simulation works as intended?

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The following question uses a robot in a grid of squares. The robot is represented as a triangle, which is initially in the bottom left square of the grid and facing right.

Consider the following code segment, which moves the robot in the grid.

Which of the following shows the location of the robot after running the code segment?

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Consider the following spinner, which is used to determine how pieces are to be moved on a game board. The region labeled "Move 1 space" is six times as large as each of the other two regions.

Which of the following code segments can be used to simulate the behavior of the spinner?

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The question below uses a robot in a grid of squares. The robot is represented as a triangle, which is initially in the bottom-right square of the grid and facing toward the top of the grid.

 

Which of the following code segments can be used to move the robot to the gray square?

Select two answers.

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Consider the following code segment.

Which of the following CANNOT be displayed as a result of executing the code segment?

• 1 1 1 1

• 1 2 3 2

• 1 2 3 4

• 1 3 2 4

Consider the following program.

Which of the following describes the result of executing the program?

• The program displays the sum of the even integers from 0 to 10.

• The program displays the sum of the even integers from 0 to 20.

• The program displays the sum of the odd integers from 1 to 9.

• The program displays the sum of the odd integers from 1 to 19.

In a science experiment, result X is expected to occur 25% of the time and result Y is expected to occur the remaining 75% of the time. The following code segment is intended to simulate the experiment if there are 100 trials.

Line 1:  xCount ← 0

Line 2:  yCount ← 0

Line 3:  REPEAT 100 TIMES

Line 4:  {

Line 5:     IF(RANDOM(1, 4) = 1)

Line 6:     {

Line 7:        xCount ← xCount + 1

Line 8:     }

Line 9:     IF(RANDOM(1, 4) > 1)

Line 10:    {

Line 11:       yCount ← yCount + 1

Line 12:    }

Line 13: }

Line 14: DISPLAY("Result X occurred")

Line 15: DISPLAY(xCount)

Line 16: DISPLAY("times and result Y occurred")

Line 17: DISPLAY(yCount)

Line 18: DISPLAY("times.")

A programmer runs the code segment, and the following message is displayed.

Result X occurred 24 times and result Y occurred 70 times.

The result shows that 94 trials were counted, rather than the intended 100 trials. Which of the following changes to the code segment will ensure a correct simulation of the experiment?

Responses

• Replacing line 9 with IF(RANDOM(1, 4) ≥ 2)

• Replacing line 9 with ELSE

• Interchanging lines 5 and 9

• Interchanging lines 7 and 11

Consider the following code segment.

What is displayed as a result of executing the code segment?

• true false false

• true false true

• true true false

• true true true

Consider the following code segment.

What is the value of result after the code segment is executed?

• 6

• 10

• 15

• 21