## 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?

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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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