Transcript 12.6 Normal Distributions

Questions about HW…
12.6
Normal Distributions
Review Tomorrow and Friday
Ch. 12 Test: MONDAY!
Normal Distribution
• A normal distribution of data varies
randomly from the mean, creating a
mound-shaped pattern that is symmetric
about the mean when graphed.
Example 1:
• Approximate each probability.
 P(x > 1.6)
Solution…
• Press the “2nd” button, then the “vars”
button…your screen should look like this:
• Then scroll down to number 2, “normalcdf”
Solution Cont’d…
• This is what your screen should look like
now:
• Back to our example: P(x > 1.6)
Answer: about
0.0548
You Try:
• P(-2.0 < x < 0.4)
• P(x < -0.8)
• P(-1.2 < x < 1.6)
Homework
P. 811 #8 – 24 evens
*Due before you leave today*