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1 2A – W The weight of three packages are 4 lb. 10 oz., 6 lb. 13 oz, and 3 lb. 6 oz. Find the average weight of these packages. (A) 4 lb. 43 oz. (B) (C) (D) (E) 4 lb. 7
1 oz. 2 3. Find the average of .09 , .4, and . 2 (A) .31 (B) .35 (C) .04 (D) .4 (E) .45 Valerie received test grades of 93 and 88 on her first two French tests. What grade must she get on the third test to have an average of 92? (A) 95 (B) 100 (C) 94 (D) 96 (E) 92 4 lb. 15 oz. 4 lb. 6 oz. 4 lb. 12 oz. 7. If Barbara drove for 4 hours at 50 miles per hour and then for 2 more hours at 60 miles per hour, what was her average rate, in miles per hour, for the entire trip? (A) (B) (C) (D) (E) 55
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1 2 103 104 Chapter 7 8. Mr. Maron employs three secretaries at a salary of $140 per week and five salespeople at a salary of $300 per week. What is the average weekly salary paid to an employee? (A) $55 (B) $190 (C) $240 (D) $200 (E) $185 Which of the following statements are always true? I. The average of any three consecutive even integers is the middle integer. II. The average of any three consecutive odd integers is the middle integer. III. The average of any three consecutive multiples of 5 is the middle number. (A) I only (B) II only (C) I and II only (D) I and III only (E) I, II, and III 10. Mark has an average of 88 on his first four math tests. What grade must he earn on his fifth test in order to raise his average to 90? (A) 92 (B) 94 (C) 96 (D) 98 (E) 100 9. www.petersons.com Averages 105 1. SIMPLE AVERAGE
Most students are familiar with the method for finding an average and use this procedure frequently during the school year. To find the average of n numbers, find the sum of all the numbers and divide this sum by n. Example: Find the average of 12, 17, and 61. Solution:
12 + 17 61 3)90 30 When the numbers to be averaged form an evenly spaced series, the average is simply the middle number. If we are finding the average of an even number of terms, there will be no middle number. In this case, the...
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