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Help - Oliver Lehmann's 75 questions explantion

Submitted by rebeccafred on Sun, 04/22/2012 - 00:57
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PMP Exam Tips, Tricks and Lessons Learnt.

Hi,

 

I attempted the Oliver Lehmanns's 75 Qs. I am stumped by Q 27 on the Std Deviation Calculation.

 

Can someone post an explanation please? 

 

http://www.oliverlehmann.com/pmp-self-test/75-free-questions.htm

 

Thanks in advance.

Rebecca.

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