Question

What is the approximate area of the shaded region under the standard normal curve below? Use the portion of the standard normal table to help answer the question.

A normal curve with a peak at 0 is shown. The area under the curve shaded is negative 1 to positive 2.

z
Probability
0.00
0.5000
1.00
0.8413
2.00
0.9772
3.00
0.9987
0.16
0.68
0.81
0.84

Answer 1

~ 81.8%

Explanation:

I THINK this is what you want:

Look at the attached normal distribution curve below....add the percentages in the boxed-in region:

Using z-score table : + 2 = .9772

-1 = .1587

.9772 - .1587 = .8185 = 81.85%

Answer 2

0.81

Explanation:

For those (including me) who dont understand, or forgot that 81% is the same as 0.81.