5.8 The Normal Distribution

5.8 The Normal Distribution

Multiple Choice

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

• mean, μ

• standard deviation, μ

• standard deivation, σ

• mean, σ

Multiple Choice

The averaged distance away points are from the center of a normal distribution is called the ________ and is represented by the symbol, ___.

• mean, μ

• standard deviation, μ

• standard deviation, σ

• mean, σ

Fill in the Blanks

The area within one standard deviation away from the mean represents

% of the population.

Fill in the Blanks

The area within two standard deviations away from the mean represents

% of the population

Multiple Choice

The percent of the data within 1, 2, and 3 standard deviations is _____ away from the mean, respectively.

• 65%, 90%, 95%

• 68%, 95%, 99.7%

• 50%, 75%, 100%

• 55.5%, 88.8%, 99.9%

Multiple Choice

What percentages of pregnancies last less than 250 days?

• 2.35%

• 13.5%

• 16%

• 34%

Multiple Choice

What percentage of pregnancies are longer than 298 days?

• 0.15%

• 2.35%

• 2.5%

• 13.5%

Multiple Choice

To be in the shortest 2.5% of pregnancies, what is the longest that a pregnancy can last?

• 218

• 234

• 250

• 266

Multiple Choice

If a pregnancy lasts 282 days, in what percentile is it? (Percentile is a fancy way of saying “the percent below this point.”)

• 16th

• 50th

• 84th

• 95th