Finding Area from Value Normal Curve

Which proportion of the curve is the shaded area?

• greater than 0.50

• less than 125

• greater than 0.90

• less than 0.50

• equal to 0.50

Using the Standard Normal (z) Distribution Table, what is the area under the standard normal curve to the left of z=1.25?

• A. 0.1056

• B. 0.3944

• C. 0.4472

• D. 0.6056

• E. 0.8944

Find the area C+D under the normal curve.

• 0.3413

• 0.4725

• 0.4987

• 0.6827

• 0.9545

Using the Standard Normal (z) Distribution Table, what is the area to the right of z=1.64 under the standard normal curve? Explain how you find it.

• .9495 because I found the intersection of 1.6 and .04 from the z-table

• .0505 because I found the area tot he left and thenI subtracted it from the total area=1

• -.0678 becaus eI found the area to the left and subtracted 1 from the value I found on the table

• -0.98 because I found the closest area to .1640 and then found the z-score for it.

The variable [z] is normally distributed. What is the probability P(z < -0.63) ? (What is the probability of finding a z-score less than -0.63?)

• 0.1321

• 0.2643

• 0.2676

• 0.3132

• 0.5132

The variable z is normally distributed. What is the value of a , if P(z < a) = 0.39 (if the probability of find a z-core less than a is found by using the area of 0.39 ?) (Hint: use probability to find the zscore)

• −1.23

• −0.28

• 0.35

• 0.65

• 1.23

Using the Standard Normal (z) Distribution Table, what is the area to the right of 0.72 under the standard normal curve?

• A. 0.1179

• B. 0.2358

• C. 0.2642

• D. 0.3821

• E. 0.7642

This data is normally distributed.  What percent of the data is in the shaded region?

• 68%

• 95%

• 99.7%

• 50%

This data is normally distributed.  What percent of the data is in the shaded region?

• 68%

• 32%

• 95%

• 50%

The ages of the population of people living in Meru area in Ipoh are Normally distributed with mean 43 and standard deviation 14

The town has a population of 5,000.

How many would you expect to be aged between 22 and 57?

You can use this Standard Normal Distribution curve:

• 1750

• 3860

• 3870

• 4330