AP Stats

The weights of paper discarded each week by households are normally distributed with a mean of 9.43 pounds and a standard deviation of 4.17 pounds.  What percent of households discard between 10 and 12 pounds? 

• 17.68%

• 6.50%

• 28.55%

• 82.32%

The weights of paper discarded each week by households are normally distributed with a mean of 9.43 pounds and a standard deviation of 4.17 pounds.  What percent of households throw out fewer than 2 pounds of paper each week?

• 96.26%

• 48.13%

• 3.74%

• 1.87%

Find the area under the standard normal curve that is to the left of z=0.88.

• 0.1894

• 0.8106

• 1.1750

• -1.1750

Find the area under the standard normal curve that is to the right of 0.46

• 0.1004

• .3111

• 0.6772

• 0.3228

Is this a probability distribution?

• No, the sum of p(x) does not equal 1.

• Yes, all p(x) are between 0 and 1.

• No, all p(x) are not between 0 and 1.

• Yes, the sum p(x) is 1.

Is this a probability distribution?

• No

• Yes

• A

• B

• C

• D

• E

Find the area under the standard normal curve that is between z=-1.5 and z=2.5

• 0.9270

• 0.0606

• 0.9938

• 0.0062

Find the z-score for which the area to its right is 0.75

• 0.2266

• 0.7734

• -0.6745

• 0.6745

Find the area under the standard normal curve that is to the right of -1.85

• 0.0322

• 0.9357

• -0.9357

• 0.9678