Science

Math

Humanities

... and beyond

Socratic Meta
Featured Answers

Topics

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#

Related questions

See all questions in The Standard Normal Distribution

Impact of this question

1896 views around the world

You can reuse this answer
Creative Commons License