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Page 1: Lat Soal Rata-rata - edscyclopedia.comedscyclopedia.com/wp-content/uploads/2016/09/Lat_Soal_Rata-rata.pdf · LATIHAN SOAL MENGENAI ... incoming calls per day to the company’s toll-free

LATIHAN SOAL MENGENAI RATA-RATA

1. There are 10 salespeople employed by Midtown Ford. The number of new cars sold last

month by the respective salespeople: 15, 23, 4, 19, 18, 10, 10, 8, 28, 19. Compute the

arithmetic mean.

2. The accounting department at a mail-order company counted the following numbers of

incoming calls per day to the company’s toll-free number during the first 7 days in May: 14,

24, 19, 31, 36, 26, 17. Computte the arithmetic mean.

3. The Human Relations Director at Ford began a study of the overtime hours in the Inspection

Department. A sample of 15 workers showed they worked the following number of

overtime hours last month: 13, 13, 12, 15, 7, 15, 5, 12, 6, 7, 12, 10, 9, 13, 12. Compute the

arithmetic mean.

4. AAA Heating and Air Conditioning completed 30 jobs last month with a mean revenue of

$5,430 per job. The president wants to know the total revenue for the month. Based on

limited information, can you compute the total revenue? What is it?

5. The Bookstall Inc. is a speciality bookstore concentrating on used books sold via the Internet.

Paperbacks are $1.00 each, and hardcover books are $3.50. Of the 50 books sold last

Tuesday morning, 40 were paperback and the rest were hardcover. What was the weighted

mean price of a book?

6. Andrews and Associates specialize in corporate law. They charge $100 an hour for

researching a case, $75 an hour for consultations, and $200 an hour for writing a brief. Last

week one of the associates spent 10 hours consulting with her client, 10 hours researching

the case, and 20 hours writing a brief. What was the weighted arithmetic mean hourly

charged for her legal services?

7. The following table shows a frequecy distribution of masses (recorded to the nearest kg) of

100 male students at XYZ University. Find the mean mass of all the male students at XYZ

University.

Mass (kg) Frequency

60 – 62 5

63 – 65 18

66 – 68 42

69 – 71 27

72 - 74 8

8. The following table shows a frequency distribution of the monthly wages in pounds sterling

of 65 employees at the P and R Company. Compute the mean monthly wage.

Wages (£) Number of Employees

50.00 – 59.99 8

60.00 – 69.99 10

70.00 – 79.99 16

80.00 – 89.99 14

90.00 – 99.99 10

100.00 – 109.99 5

110.00 – 119.99 2