# Homework Help: Distribution Plot

1. Aug 3, 2010

### sami23

The problem statement, all variables and given/known data
Normal: mean = 0 standard deviation = 1

Is it:
10th percentile of standard normal distribution is -1.28
10th upper percentile of standard normal distribution is 0.1
90th percentile of standard normal distribution is -1.28
10th percentile of standard normal distribution is 1.28

The attempt at a solution

Area under the curve is the Population, at the center or x is the mean, let $$\alpha$$/2 be the area shaded in red.

...lost. I know that in standard normal distribution N(mean, variance) = N(0,1) and to get the confidence interval = 1 - $$\alpha$$ = 0.1 which would be 90% (to the left)

I think it would be 10th upper percentile (to the right)