How to find the probability using a normal distribution curve

The video tutorial explains the concept of standard distribution, focusing on the mean and standard deviation. It details how to calculate values within one, two, and three standard deviations and discusses the probability of selecting a value within a given interval. The tutorial emphasizes the importance of understanding the percentages associated with each deviation and the challenges of accounting for all data in a standardized distribution.

What is the mean value in the given standard distribution?

• 60

• 50

• 40

• 70

How much of the data is within the first standard deviation?

• 34%

• 50%

• 95%

• 68%

What percentage of data falls within the second standard deviation?

• 50%

• 34%

• 2.35%

• 13.5%

Which percentage is associated with the third standard deviation?

• 34%

• 2.35%

• 13.5%

• 50%

What is the probability of selecting a value at most 56?

• 99.7%

• 84%

• 68%

• 50%