Normal Distribution 1

Which of the following is a measure of variability?

• mean
• median
• mode
• standard deviation

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CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

CCSS.HSS.ID.A.4

If a number is added to the set that is in the middle of the data, how does this affect the range?

• increase
• decrease
• stay the same
• both increase and decrease

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CCSS.6.SP.A.2

CCSS.6.SP.A.3

CCSS.6.SP.B.5

If 10 is added to every value in a set of data, what will happen to the value of the standard deviation?

• it will increase
• it will decrease
• it will stay the same
• it will both increase and decrease

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CCSS.6.SP.A.3

CCSS.6.SP.B.5

Mrs. Algebra's class has an average grade of 87. Later on she realizes she left out Joe's score. His grade was a 65. The new mean will ,....

• increase
• decrease
• stay the same

What does this symbol represent?

• Standard Deviation
• Variance
• Mean Absolute Deviation
• Sigma

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CCSS.6.SP.A.3

CCSS.6.SP.B.5

Roger bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is the range of Roger's scores?

• 193
• 127
• 60
• 66

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CCSS.6.NS.B.3

Company A has a mean of 90 and a standard deviation of 20

Company B has a mean of 75 and a standard deviation of 30.

Which company had less variation?

• Company A because the standard deviation was lower

• Company A because the mean was higher

• Company B because the standard deviation was higher

• Company B because the mean was lower

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 12 and 15 days?

• 68%
• 34%
• 16%
• 2.5%

At a local high school, GPA's are normally distributed with a mean of 2.9 and standard deviation of 0.6. What percentage of students at the high school have a GPA between 2.3 and 3.5?

• 68%
• 99.7%
• 95%
• 84%

The average waist size for teenage males is 29 inches with a standard deviation of 1.4 inch. 
If waist sizes are normally distributed, estimate the proportion of teenagers who will have waist   sizes greater than 31 inches?

• 92.4%
• 10.5%
• 16%
• 7.6%

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CCSS.HSS.ID.A.4