36. Wildlife Management A wildlife manager measured and tagged twelve adult male crocodiles. The data he collected are below. He estimates the crocodiles will grow 0.1 m each year. What will be the mean, median, mode, and range of the crocodiles' lengths after 4 yr?

    Crocodile Lengths (m)

    2.4	2.5	2.5	2.3
    2.8	2.4	2.3	2.4
    2.1	2.2	2.5	2.7

37. Reasoning A friend tells you to apply for a sales job at a certain company because the salespeople earned an average of $47,500 last year. Last year, 6 salespeople earned $33,000, 3 earned $46,000, 2 earned $42,000, and 1 earned $150,000. Would you apply for the job based on what your friend says? Explain.

C Challenge

38. Travel During the first 6 h of a car trip, your average speed is 44 mi/h. During the last 4 h of your trip, your average speed is 50 mi/h. What is your average speed for the whole trip? (Hint: First find the total number of miles traveled.)
39. Find the mean, median, mode, and range of the following algebraic expressions: 9x, 4x, 11x, 7x, 5x, 4x. Assume that x > 0 . x greater than 0 .

Standardized Test Prep

SAT/ACT

40. What is the mean of the data set 9, 16, 13, 20, and 17?
    1. 13
    2. 15
    3. 16
    4. 17
41. What is the slope of a line perpendicular to the graph of y = − 1 2 x + 3 ? y equals negative , 1 half , x plus 3 . question mark
    6. − 2 negative 2
    7. − 1 2 negative , 1 half
    8. 1 2 1 half
    9. 2
42. What are the solutions of the equation x 2 + 4 x = 5 ? x squared , plus 4 x equals 5 question mark
    1. − 5 negative 5  and 0
    2. − 5 negative 5  and − 1 negative 1
    3. − 5 negative 5  and 1
    4. 1 and 5

Short Response

43. Two points are 2.5 in. apart on a map with a scale of 1 in. : 100 m. How far apart are the actual locations represented by the points on the map? Show your work.

Mixed Review

See Lesson 12-2.

Make a histogram of each data set.

44. heights of professional basketball players:

    85 in. 82 in. 83 in. 84 in. 80 in. 82 in. 86 in. 85 in. 83 in. 84 in. 81 in. 82 in.

45. numbers of cars: 53 84 22 38 41 27 25 12 17 27 33 41 60 73 62 59 43

See Lesson 9-7.

Graph each set of points. Is a linear, quadratic, or exponential model most appropriate for each set?

46. (0, 1), (1, 3), (2, 9), (3, 27), (4, 81)
47. (6, 5), (7, 2), (8, − 1 negative 1 ), (9, − 4 negative 4 ), (10, − 7 negative 7 )

Get Ready! To prepare for Lesson 12-4, do Exercises 48–50.

See Lesson 12-3.

Find the range and median of each data set.

48. 0 2 7 10 − 1 negative 1   − 4 negative 4   − 11 negative 11
49. 64 16 23 57 14 22
50. 2.1 3.3 − 5 negative 5 .4 0.8 3.5

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