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Answered: - Please help me with these problems for my stat 200 quiz.


Please help me with these problems for my stat 200 quiz.


10. (5 points) (Show work) Prepare a frequency distribution with a class width of 2

 

minutes by completing the following table.

 

Checkout Time

 

5.0 ? 6.9

 

7.0 - 8.9

 

9.0 ? 10.9

 

11.0 ? 12.9

 

13.0 ? 14.9

 


 

Frequency

 


 

Relative Frequency

 


 

11. (2 pts) (Show work) What percentage of the checkout times was at least 9 minutes?

 


 

_______________________________________________________________

 

___

 

12. (4 pts) (Show work) To qualify for a mortgage, an applicant needs to have a good

 

FICO credit score. We chose a random sample of 5 applicants from a local bank, and

 

their FICO scores are 760, 660, 820, 580 and 620. What is the standard deviation of the

 

FICO scores in the sample? Show your intermediate calculation in the following table;

 

you may not need all columns based on the formula you use. (Round the answer to two

 

decimal places)

 

FICO

 

Score x

 

760

 

660

 

820

 

580

 

620

 

Sum

 


 

x2

 


 

x-mean

 


 

(x-mean)2

 


 

 

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