Probability Distribution Graph

What's the probability of the gray area? (Mean = 55, Standard dev = 2.5)

• 0.8185

• 0.8413

• 0.8641

• 0.8389

Based on the graph, who has the highest IQ?

• You

• Me

• Both have the same

• Not enough information

If you had to guess the probability of the gray area, which would you choose?

• 0.2

• 0.4

• 0.6

• 0.8

Which of the following are the properties of a Normal Probability Distribution.

• The distribution curve is bell - shaped.

• The curve is symmetric about its center, the mean.

• The mean, the median, and the mode coincide at the center.

• The area under the curve is 1 or 100%

• The tails of the curve is asymptotic to the base line.

What is the area under the curve between z = 0 and z = 1.45?

• .9265

• .4265

• .4500

• .5000

The center of the curve represents what value of a data set?

• μ

• δ

• Σ

• Ζ

What is the area under the curve to the left of z = 0.55 ?

• .2912

• .5500

• .9394

• .7088

What is the total area under the curve?

• 1
• .9998
• .997
• -3 < z < 3

What shape is a normal distribution curve?

• Half curve

• Round curve

• Bell curve

• Square curve

What is the total area in the distribution under the curve?

• 0

• 1

• 2

• 3