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# TOPIC: Need help understanding Standard Deviation associated with product variation.

## Need help understanding Standard Deviation associated with product variation. 6 years 11 months ago #9955

 Heather Fleming Topic Author Offline Fresh Boarder Posts: 2 Thank you received: 0 Here is the practice question: ..standard deviation associated with the product variation was 0.7 inches and with the measurement variation was 0.5 inches, What is the total standard deviation here? a. 1.2 b. 0.86 c. 0 .49 d.0.25 the answer was b . 0.86. I have no idea how to get to this number. I was looking at the standard deviation formula: P - O/ 6 = standard deviation. Answer states to use variation formula [P -O/6 ]2. I cannot tell what the Pessimistic is or the Optimistic is in this question? Can you please help me? Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Need help understanding Standard Deviation associated with product variation. 6 years 11 months ago #9960

 Mark Wuenscher, PMP Offline Platinum Boarder Posts: 368 Karma: 1 Thank you received: 64 Heather, Can you please also post the source of the question you posted? It is important to give credit to the original author. Thanks, Mark Mark Wuenscher, PMP Community Moderator Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.

## Need help understanding Standard Deviation associated with product variation. 6 years 11 months ago #9977

 Heather Fleming Topic Author Offline Fresh Boarder Posts: 2 Thank you received: 0 the source is a practice exam from Project Management Professional Certification Exam Prep - Third Edition. Will you be able to provide me with some assistance? i'm taking my exam this week. Thank you Your e-mail address will never be displayed on the site. Check this box to be notified of replies to this topic. Note: BBcode and smileys are still usable.
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