Unit 2 Quiz - Descriptive Stats

Determine the approximate shape of distribution in the histogram.

• Symmetric

• Skewed Right

• Bimodal

• Uniform

What is the z-score corresponding to a grade point of 87, when the mean is 79 and the standard deviation is 2.25?

• A

• B

• C

• D

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.

How do you calculate Standard Deviation?

• Square the variance

• Divide an ordered data four equal parts

• Square root the variance

• Square the mean

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?

• 
• 
• 

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.

33, 25, 42, 25, 31, 37, 46, 29, 38

What is the Q3 of the data?

• 37

• 40

• 42

• 46

The shape of the data in the dot plot is:

• Skewed Left

• Skewed Right

• Symmetric