Posted by **Jackie** on Monday, April 15, 2013 at 1:56am.

For a Normal distribution with mean, mu=2, and standard deviation, sigma = 4,

70% of all observations have values between x and y . (Round to 4 decimal places.)

- Math -
**Steve**, Monday, April 15, 2013 at 11:39am
Consult your standard Z table. 35% of all observations occur between 0 and 1.04σ. So, 70% occur between -1.04σ and 1.04σ.

So, that means that the actual values occur in

2-1.04(4) <= x <= 2+1.04(4)

-2.16 <= x <= 6.16

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