Use data in worksheet labeled Q7. (attached)

1)     Rusty’s Used Cars randomly selected 20 days of sales data over the last year. Using the provided data for sales on these dates, what is the standard deviation of cars sold?

A.   20.69

B.    4.33

C.    4.55

D.   5.12

 

Use data in worksheet labeled Q8. (attached)

2)     Two different classes at a local University had tests on the same day. A sample of test scores from each class was compared. The test from class 1 was graded out of 100 points. The test from class 2 was graded out of 200 points. From the data provided which class had the most consistent test scores.

A.   The test from class 1 was most consistent.

B.    The test from class 2 was most consistent

C.    The tests are equally consistent

D.   It cannot be determined

 

3)     A data set of unknown distribution had a mean of 65 and a standard deviation of 10. At least how much of the data is within 2 standard deviations of the mean

A.   95.44%

B.    75%

C.    80%

D.   Exactly 65%

 

Use data in worksheet named Q10 to answer question 10 (attached).

A recent survey of 111 customers entering an appliance store asked how much money they planned to spend on appliances. 

3

4)     What is the probability that a randomly selected customer is planning to spend between $100 and $499 for appliances?

A.   .146

B.    .643

C.    .865

D.   .997

 

Use data in worksheet named Q11-12 to answer questions 11-12 (attached).

The table indicates the number of appliance customers who purchased extended warranties. The table also identifies the age group of customers. 22

 

5)     What is the probability a randomly selected customer chose to purchase a warranty?

A.   .230

B.    .415

C.    .824

D.   .992

 

6)     What is the probability that a randomly selected customer was 30 years or older and chose to purchase a warranty?

A.   .231

B.    .415

C.    .824

D.   .992

• 1496724520-Data Quesitons 7-12.xlsx

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Status NEW Posted 06 Jun 2017 04:06 AM My Price 9.00

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