Exploring Normal Distribution Concepts

The video tutorial introduces the concept of normal distribution, highlighting its key features such as symmetry around the mean and the equality of mean, median, and mode. It explains how standard deviation affects the shape of the distribution and introduces the 68-95-99.7 rule, which helps predict data spread. The tutorial includes an example problem to demonstrate the application of these concepts and concludes with a practice problem for viewers to solve.

What is a common term used to describe a normal distribution?

• Exponential curve

• Flat curve

• Bell curve

• Skewed curve

In a normal distribution, what is true about the mean, median, and mode?

• Mode is less than median

• They are all the same

• Mean is greater than median

• They are all different

What percentage of data lies above the mean in a normal distribution?

• 100%

• 25%

• 50%

• 75%

What happens to the normal distribution curve when the standard deviation is increased?

• It shifts to the left

• It shifts to the right

• It becomes taller and narrower

• It becomes shorter and wider

How does changing the mean affect the normal distribution curve?

• It changes the shape of the curve

• It makes the curve taller

• It shifts the curve left or right

• It makes the curve wider

According to the 68-95-99.7 rule, what percentage of data lies within one standard deviation of the mean?

• 68%

• 50%

• 95%

• 99.7%

What percentage of data lies within two standard deviations of the mean in a normal distribution?

• 99.7%

• 50%

• 95%

• 68%

What is the probability that a part will fail between 50,000 and 55,000 miles if the mean is 60,000 miles and the standard deviation is 5,000 miles?

• 68%

• 34%

• 2.35%

• 13.5%

What is the probability that a part will fail before 55,000 miles if the mean is 60,000 miles and the standard deviation is 5,000 miles?

• 2.35%

• 34%

• 16%

• 13.5%

If the mean amount of mustard dispensed is 0.9 ounces with a standard deviation of 0.1 ounces, what is the probability that the machine will dispense one or more ounces of mustard?

• 2.35%

• 13.5%

• 34%

• 16%