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: IF(RANDOM (1, 4) = 1) Line 5: 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)

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: IF(RANDOM (1, 4) = 1) Line 5: 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)

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

question 34

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?

A
Replacing line 9 with IF(RANDOM (1, 4) > 2)
Replacing line 9 with ELSE
Interchanging lines 5 and 9
D
Interchanging lines 7 and 11

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