6、Use the results from the following survey of 500 firms to answer the question.

The width of each interval (class) for this frequency table is:

A)   50.

B)   101.

C)   100.

D)   600.

7、Use the results from the following survey of 500 firms to answer the question.

The lower boundary of the fifth interval (class) is:

A)   701.

B)   750.

C)   700.

D)   800.

8、Use the results from the following survey of 500 firms to answer the question.

The cumulative relative frequency of the second interval (400 to 500) is:

A)   20.4%.

B)   10.2%.

C)   36.0%.

D)   12.4%.

9、Use the results from the following survey of 500 firms to answer the question.

The frequency of the third class is:

A)   156.

B)   78.

C)   180.

D)   500.

10、Use the results from the following survey of 500 firms to answer the question.

The number of classes in this frequency table is:

A)   6.

B)   5.

C)   100.

D)   600.

答案和详解如下：

6、Use the results from the following survey of 500 firms to answer the question.

Number of Employees	Frequency
300 up to 400	40
400 up to 500	62
500 up to 600	78
600 up to 700	101
700 up to 800	131
800 up to 900	88

The width of each interval (class) for this frequency table is:

A)   50.

B)   101.

C)   100.

D)   600.

The correct answer was

Max of interval - Min of interval = 100 C)     

7、Use the results from the following survey of 500 firms to answer the question.

Number of Employees	Frequency
300 up to 400	40
400 up to 500	62
500 up to 600	78
600 up to 700	101
700 up to 800	131
800 up to 900	88

The lower boundary of the fifth interval (class) is:

A)   701.

B)   750.

C)   700.

D)   800.

The correct answer was C)

700 - 800, lower boundary = 700

8、Use the results from the following survey of 500 firms to answer the question.

Number of Employees	Frequency
300 up to 400	40
400 up to 500	62
500 up to 600	78
600 up to 700	101
700 up to 800	131
800 up to 900	88

The cumulative relative frequency of the second interval (400 to 500) is:

A)   20.4%.

B)   10.2%.

C)   36.0%.

D)   12.4%.

The correct answer was A)    

62 + 40 = 102, 102/500 = .204 or 20.4%

9、Use the results from the following survey of 500 firms to answer the question.

Number of Employees	Frequency
300 up to 400	40
400 up to 500	62
500 up to 600	78
600 up to 700	101
700 up to 800	131
800 up to 900	88

The frequency of the third class is:

A)   156.

B)   78.

C)   180.

D)   500.

The correct answer was B)

The third class is 500 - 600 with a frequency of 78.

10、Use the results from the following survey of 500 firms to answer the question.

Number of Employees	Frequency
300 up to 400	40
400 up to 500	62
500 up to 600	78
600 up to 700	101
700 up to 800	131
800 up to 900	88

The number of classes in this frequency table is:

A)   6.

B)   5.

C)   100.

D)   600.

The correct answer was A)

300 - 400 = 1, 400 - 500 = 2, 500 - 600 = 3, 600 - 700 = 4, 700 - 800 = 5, 800 - 900 = 6, Total = 6