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Questions and Answers

(189 solutions)

A class of 20 students has an average age of 24.  Two students leave the class, and both of the students are 20 years old.  What is the new class average age?
  
  
  
  

Ans is 24.4...

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A sample has n = 7 scores and a mean of M = 8.  One new score was added to the sample and the new mean is M = 10. What is the value of the sum of scores (𝝨x)?
  
  
  
  

ans is 80...

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After 4 points have been added to every score in a distribution the mean is calculated and found to be M = 34. What was the value before?
  
  
  
  

...

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A sample of n = 10 and has mean of M = 5. If each score is multiplied by 3, then the new mean is:
  
  
  
  

...

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A population has a mean of µ = 5 and ∑x = 225. How many scores are in the population?
  
  
45
 
  
  

Ans is 45...

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What is the mean for the following set of population scores:

xf
71
61
52
43
36
26
11
  
  
  

...

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Using the graph below, how many scores are there (N)?


...

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What is the shape of the following distribution of values (draw a picture to help):

12334445555

Negative skew

None of the above

Symmetrical and normal

Positive skew

...

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The number of male and female professors at a state college are recorded and placed in a frequency table. What type of graph should be used to present these data?


Scatterplot

Bar graph

Bar graph or histogram

Histogram or Polygon

...

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Scores from a quiz are recorded and are presented in a frequency table. What type of graph should be used to present quiz scores?

Scatterplot

Histogram or Polygon

Bar graph

Bar graph or Histogram

...

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