MAM Unit 4 Normal Distribution

What shape is a normal distribution curve?

• Half curve

• Round curve

• Bell curve

• Square curve

The normal curve is symmetrical about the mean.

• True

• False

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

• 25%

• 68%

• 95%

• 99.7%

According to the empirical rule, how much of the data falls within 2 standard deviations of the mean?

• 25%

• 68%

• 95%

• 99.7%

The area under the normal curve is 1.

• True

• False

If this is the graph of data normally distributed with a mean of 30 and a standard deviation of 5, what label (number) is written at the blue circle?

• 20

• 15

• 40

• 30

The distribution above is normal. What percent lies below the curve?

• 68%

• 95%

• 99.7%

• 100%

The distribution above is normal. What percent lies between ±3 standard deviations?

• 68%

• 95%

• 99.7%

• .3%

Between what two standard deviations of a normal distribution contain 68% of the data?

• one below and one above
• two below and two above
• two below and zero
• zero and two above

Find the area of the shaded region.

• 16%

• 84%

• 68%

• 34%