For the following histogram of test scores, The majority of scores came between

8. For the following histogram of test scores, The majority of scores came between______

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(a) 39.5 and 49.5

(b) 89.5 and 99.5

(c) 79.5 and 89.5

(d) 159.5 and 169.5

(For Questions 9 & 10)  The checkout times (in minutes) for 10 randomly selected customers at a

large supermarket during the store’s busiest time are as follows:

6 5 8 12 8

13 10 14 7 11

9.  (5 points)  (Show work) Find the minimum, maximum, median, mode and mean of the

checkout time. (Round the answers to one decimal place)

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

completing the following table.

Checkout Time Frequency Relative Frequency

5.0 – 6.9

7.0  – 8.9

9.0 – 10.9

11.0 – 12.9

13.0 – 14.9

__________________________________________________________________

(For Questions 11 & 12)  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, 650, 820, 540 and 620.

11.  (4 points)  (Show work) What is the standard deviation of the FICO scores in the

sample?   Please 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 x

2

x-mean (x-mean)

2

760

650

820

540

620

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Sum

12.  (2 points)  (Show work) A data value is considered unusual if it’s above or below 2 standard

deviations from the mean. Are any of these FICO scores considered unusual?  Explain.