Standard Deviation Discrete Probability

What is the variance of the probability distribution?

• 1.66

• 1.08

• 1.01

• 2.20

What do you call a normal distribution with a mean of 0 and a

standard deviation of 1?

• Frequency Distribution

• Probability Distribution

• Standard Normal Distribution

• Cumulative Distribution

The average time for a courier to travel from Manila to Pampanga is 200 minutes, and the standard deviation is 10 minutes. What standard score corresponds to a trip that takes 180 minutes?

What is the area of the region in the normal curve between one standard deviation below the mean and three standard deviations above the mean?

Does the following table represent a probability distribution?

• Yes, because each value of F(X) is between 0 and 1, and the sum of all values of F(X) is 1.

• No, because each value of F(X) is between 0 and 1.

• No, because the sum of all values of F(X) is 1.

• Yes, because all values of F(X) are the same.

The area under the part of normal curve in the standard normal distribution that lies within 2 standard deviations of the mean is

• 68%

• 95%

• 99.7%

• 100%

The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees. Approximately what percent of days in February will be between 14.6 and 31.4 degrees?

• 68%

• 50%

• 99.7%

• 95%

Which represents the number of standard deviations from the mean for the 85th percentile?

• 2.58

• -2.58

• -1.04

• 1.04