Introduction to Normal Distribution

What's the standard deviation?

• 150

• 60

• 240

• 30

A normal distribution has a mean of 61 and a standard deviation of 15. What is the median?

Mathematical Equivalence

ON

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

What shape is a normal distribution curve?

• Half curve

• Round curve

• Bell curve

• Square curve

The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees.  What is the z-score for a temperature of 17 degrees?  

• 1 

• 1.43

• -1.43

• 11.5

Find the value for 
P(Z > 1.78)

• 0.0376

• 0.0375

• 0.0446

• 0.2420

Find the value for 
P(Z < -0.39)

• 0.3498

• 0.3483

• 0.3501

• 0.6502

Find the value for
P( 0 < Z < 0.62)

• 0.7676

• 0.2324

Find the z-score such that the area left of z is .3015 on the standard normal curve.

• -1.88

• 0.52

• -0.52

• 1.88

According to the empirical rule, what percentage of data falls within 1 standard deviation? 

• 25%

• 68%

• 95%

• 99.7%