Located at the center of a normal distribution is the ________ and it is represented by the symbol, ___.

Where do we place the mean on a normal distribution curve?

Where would we see standard deviations added to the mean?

Where would we see standard deviations subtracted from the mean?

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

Using the empirical rule, what is the percentage of data that falls within two standard deviations of the mean?

What is the percentage of data that falls within three standard deviations of the mean, according to the empirical rule?

What percentages of pregnancies last less than 250 days?

What percentage of pregnancies are longer than 298 days?

Using the Empirical Rule:

The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.

About what percent of the products last between 12 and 15 days?

A machine is used to put bolts into boxes. It does so such that the actual number of bolts in a box is normally distributed with a mean of 106 and a standard deviation of 2. What is the probability of selecting a box that contains less than 108 bolts?

Which interval shows 68% of the data given a mean of 15 and a standard deviation of 3? 

Hint: Sketch the Normal Distribution curve.

500 juniors at Central High School took the ACT last year. The scores were distributed normally with a mean of 24 and standard deviation of 4. Approximately how many juniors scored between 16 and 32?

Which of the following is a disadvantage of the Empirical Rule?

How did you feel about today's lesson? How confident were you about the material?