For a normal distribution with mean

0

and standard deviation

1

, find the

z-score values that divide the distribution so that they separate

a.

the middle 80% from the extreme 20% in the tails

b.

the middle 85% from the extreme 15% in the tails

c.

the middle 90% from the extreme 10% in the tails

d.

the middle 95% from the extreme 5% in the tai