11-3 & 11-4 review

The median is....

• the number most occurring
•  the highest number
• the lowest value subtracted from the highest value
• the middle value when ordered from least to greatest

What is the Q1 of this data set?
6, 7, 2, 1, 5, 2, 1, 6

• 1

• 1.5

• 2

• 2.5

What is the Q3 of this data set?
6, 7, 2, 1, 5, 2, 1, 6

• 5
• 6
• 5.5
• 6.5

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

Find the mean of these numbers:
2, 57, 38, 42, 6

• 29
• 38
• 50
• 145

What is the shape of the distribution?

• Skewed Left 
• Skewed Right
• Symmetric
• Bimodal

What is the shape of the distribution?

• Skewed Left 
• Skewed Right
• Symmetric
• Bimodal

Given that the data is symmetric, which pair of measures should be used to represent the data?

• center: median

  spread: standard deviation

• center: mean

  spread: IQR

• center: mean

  spread: standard deviation

• center: median

  spread: IQR

According to the empirical rule, what percentage of data falls within 1 standard deviation? 

• 25%
• 68%
• 95%
• 99.7%

In a factory, the weight of the concrete poured into a mold by a machine follows a normal distribution with a mean of 1150 pounds and a standard deviation of 22 pounds. Approximately 95% of molds filled by this machine will hold weights in what interval? 

• 1084 to 1216 pounds 
• 1106 to 1150 pounds 
• 1106 to 1194 pounds 
• 1128 to 1172 pounds