Posted by **Tom 6** on Saturday, June 15, 2013 at 4:52pm.

The middle 69% of a normally distributed population lies between what two standard scores? (Give your answers correct to two decimal places.)0.31 and 1.69 was my answers and they are wrong????. .

- Math check -
**Steve**, Saturday, June 15, 2013 at 7:15pm
You want the Z values containing 69%. Those are -1 <=Z <= 1

(well, 1.015, really)

that is, within 1 std of the mean.

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