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Question #cef5e

1 Answer

Nov 22, 2016

The standard deviation is #sigma=1.5#

Explanation:

The z-score is #=(r-mu)/sigma#

Here we know.

#mu=8#

and #P (6< r <10)=0.5 #

Therefore, #P(8< r <10)=0.25#

We look for the probability #P=0.5# in the z-table

#z=0.67#

Therefore, #(10-8)/sigma=0.67#

#sigma= 2/0.67=1.5#

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