Basic Mathematics for College Students

operation the same?

50. Find the difference in the number of ski resorts in
    operation in 2001 and 2008.


51. Between which two years was there the greatest
    decrease in the number of ski resorts in operation?
    What was the decrease?


52. Between which two years was there the greatest
    increase in the number of ski resorts in operation?
    What was the increase?

Refer to the line graph below to answer the following questions.
See Example 7.

53. Which runner ran faster at the start of the race?


54. At time A, which runner was ahead in the race?


55. At what time during the race were the runners tied
    for the lead?


56. Which runner stopped to rest first?


57. Which runner dropped his watch and had to go back
    to get it?


58. At which of these times (A, B, C, D, E) was runner 1
    stopped and runner 2 running?


59. Describe what was happening at time E.
    Who was running? Who was stopped?


60. Which runner won the race?

A

Start

Time

Distance from the

starting line

Finish

B C D E

Runner 1

Runner 2

475

480

485

490

495

2001

Year

Source: National Ski Area Assn.

2002 2003

Number of U.S. Ski Resorts in Operation

2004 2005 2006 2007 2008

Refer to the histogram and frequency polygon below to answer

the following questions. See Example 8.

61. COMMUTING MILES An insurance company
    collected data on the number of miles its employees
    drive to and from work.The data are presented in the
    histogram below.
    a. How many employees have a commute that is in
    the range of 15 to 19 miles per week?
    b. How many employees commute 14 miles or less
    per week?


62. NIGHT SHIFT STAFFING A hospital
    administrator surveyed the medical staff to determine
    the number of room calls during the night. She
    constructed the frequency polygon below.
    a. On how many nights were there about 30 room
    calls?
    b. On how many nights were there about 60 room
    calls?

100

120

80

60

40

20

Frequency

(number of nights)

10 20 30 40 50 60

Number of room calls

Number of Room Calls per Night

4.5

10

20

30

40

50

60

Frequency

9.5 14.5 19.5

Number of miles driven

Commuting Miles per Week

24.5 29.5

9

13

27

51

36

7.1 Reading Graphs and Tables 605