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ASQ CSSGB Exam - Topic 1 Question 86 Discussion

Due to excessive pollution, GREEN Solutions Inc. is considering subsidizing public transportation to work for its employees. According to the manager it takes an average weekday commute of 39 minutes with a Standard Deviation of 7 minutes for the employees to get to work while they use their personal vehicles for their office commute while the management set a policy of not more than 40 minutes for their daily one-way commute. A survey conducted one day on 70 employees showed an average of 34 minutes commuting time using the metro public transportation system with a Standard Deviation of 21 minutes. Assuming a Normal Distribution for the commute times by either personal or public transportation, which of these is true?
B) The probability that they would arrive on time using the MPTS is much higher than using their personal vehicles
A) The probability that they would arrive on time using personal vehicles is much higher than using the metro public transportation system (MPTS)
C) The two probabilities are about the same excepting in one case the consistency is higher than the other
D) We need to compile more data around weekends to incorporate for traffic differences
E) When Standard Deviation is higher the probability goes down and so the MPTS is worse

ASQ CSSGB Exam - Topic 1 Question 86 Discussion

Actual exam question for ASQ's CSSGB exam
Question #: 86
Topic #: 1
[All CSSGB Questions]

Due to excessive pollution, GREEN Solutions Inc. is considering subsidizing public transportation to work for its employees. According to the manager it takes an average weekday commute of 39 minutes with a Standard Deviation of 7 minutes for the employees to get to work while they use their personal vehicles for their office commute while the management set a policy of not more than 40 minutes for their daily one-way commute. A survey conducted one day on 70 employees showed an average of 34 minutes commuting time using the metro public transportation system with a Standard Deviation of 21 minutes. Assuming a Normal Distribution for the commute times by either personal or public transportation, which of these is true?

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Suggested Answer: B

by Adelina at Jun 16, 2026, 12:55 PM

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Hoa
3 days ago
C could be true. Consistency matters in commuting.
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Penney
8 days ago
But A makes sense too. Personal vehicles are more reliable.
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Desiree
14 days ago
I think B is correct. MPTS is faster on average.
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Adolph
19 days ago
But isn't 34 minutes pretty good for public transport?
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Marci
24 days ago
I think we need more data to really compare these options.
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Shantell
29 days ago
Wait, does that mean MPTS is actually worse?
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Linn
1 month ago
Totally agree, MPTS has a way higher standard deviation!
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Vanna
1 month ago
Personal vehicles have a lower average commute time for sure.
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Huey
1 month ago
I feel like option B makes sense since the average for the metro is lower, but I’m not confident about the probabilities without more data on traffic patterns.
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Dion
2 months ago
I’m a bit confused about the implications of the higher standard deviation for the metro system. Does that really mean it’s worse for arriving on time?
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Sang
2 months ago
I think we had a similar question about comparing commute times, and it seemed like the lower standard deviation meant more consistency, which might favor the personal vehicles.
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Georgene
2 months ago
I remember we discussed how the average commute time affects probabilities, but I'm not sure how the standard deviations play into this.
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