Statistics Data Analysis

What is the standard deviation for the data given:
{11, 22, 18, 91, 68, 45, 33, 71, 19}

• 26.82

• 28.45

• 809.41

• 719.31

Given a normal distribution, what percentage of all values fall within 1 standard deviation from the mean?

• 34%

• 68%

• 95%

• 13.5%

Given a normal distribution, with a mean of 65 an a standard deviation of 8, what percentage of values are within the interval [41,81]?

• 95%

• 99.7%

• 97.5%

• 97.35%

Suppose a data set is distributed normally. The mean is 125 and standard deviation is 7. What data value is 2 standard deviations above the mean?

• 111

• 153

• 139

• 118

479 freshman at Woodrow Wilson took an Algebra test. The scores were distributed normally with a mean of 68 and a standard deviation of 6. How many students scored between 62 and 86?

• 325

• 390

• 401

• 455

2

• F

• G

• H

• J

• K

5

• A

• B

• C

• D

• E

14

• F

• G

• H

• J

• K

28

• F

• G

• H

• J

• K

37

• A

• B

• C

• D

• E