Standard Deviation and Distribution

According to the normal distribution, what percentage of data falls within 1 standard deviation?

• 25%

• 68%

• 95%

• 99.7%

According to the normal distribution, how much of the data falls within 3 standard deviations?

• 25%

• 68%

• 95%

• 99.7%

What is the standard deviation of this distribution? (how far is it from the mean to the first stdev line?)

• 1010

• 20

• 60

• 40

The mean GPA of students in a course at UCDavis is 3.2 with a standard deviation of 0.3. What percent of students in the course have a GPA between 2.9 and 3.5?

• 81.5%

• 47.5%

• 68%

• 95%

What shape is another name for a normal distribution?

• Half curve

• Round curve

• Bell curve

• Square curve

What percentage of females are taller than 5'9.5'?

• 16%

• 68%

• 81.5%

• 95%

The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.

•  28,000 km and 32,000 km.

• 24,000 km and 34,000 km.

• 26,000 km and 34,000 km.

• 27,000 km and 31,000 km.

The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days. About what percent of the products last between 6 and 18 days?

• 68%

• 95%

• 99%

• 2.5%

What is the standard deviation for the data given:
5, 10, 7, 12, 0, 20, 15, 22, 8, 2

• 6.89

• 10.1

• 7.26

• 9

68% of the marks in a test are between 51 and 64

Assuming this data is normally distributed, what are the mean and standard deviation?

• Mean = 57

  S.D. = 6.5

• Mean = 57

  S.D. = 7

• Mean = 57.5

  S.D. = 6.5

• Mean = 57.5

  S.D. = 13