9-16 Review - Unit 2 Descriptive Statistics

The frequency distribution above shows the grades earned by 144 students in Math. What is the relative frequency of those who earned a C? Round to the nearest hundredth.

•  $0.44$  

•  $0.76$  

•  $2.25$  

•  $1.31$  

The frequency distribution above shows the grades earned by 144 students in Math. What is the cumulative frequency of those who earned at least a D? Round to the nearest whole number.

•  $144$  

•  $132$  

•  $64$  

•  $110$  

Determine whether the approximate shape of the distribution in the histogram is symmetric, uniform, skewed left, skewed right, or none of these.

• Symmetric

• Skewed Right

• Skewed Left

• Uniform

Tags

CCSS.6.SP.A.2

CCSS.6.SP.B.4

Ten students were asked how many times each week they buy lunch at school. The results are shown below.

2, 1, 5, 2, 3, 3, 5, 3, 4, 2

Which of the following dot plots correctly represents this data?

• 
• 
• 

Tags

CCSS.6.SP.A.2

CCSS.6.SP.B.4

The shape of the data above is.

• Skewed Left

• Skewed Right

• Symmetric

The appropriate measure of central tendency is ________ and the value is located at ___________.

• mode

• mean ; left

• median; left

The percent of data falling between 1 standard deviation below and above the mean is

• 68%

• 34%

• 95&

• 99.7%

The percent of data falling between 2 standard deviations below and above the mean is

• 95%

• 68%

• 99.7%

• 13.5%

The percent of data falling between 3 standard deviations below and above the mean is

• 81.5%

• 68%

• 99.7%

• 95%

A normal distribution has a mean of 35 and a standard deviation of 8. What percent of data points are between 27 and 43?

• 34%

• 68%

• 81.5%

• 95%