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arva
11 diapositives · 611 Views · Oct 13, 2014

Average. Averages. If the average (arithmetic mean) of three consecutive integers is A, which of the following must be true? i. One of the numbers is equal to A ii. The average of two of the three numbers is A. iii. A is an integer.

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  1. Average

  2. Averages If the average (arithmetic mean) of three consecutive integers is A, which of the following must be true? i. One of the numbers is equal to A ii. The average of two of the three numbers is A. iii. A is an integer. a) i. only b) ii. only c) iii. only d) i. and ii only e) i., ii., and iii.

  3. Averages If the average (arithmetic mean) of 10, 20, 30, 40, and x is 60, what is the value of x?

  4. Averages The average (arithmetic mean) weight of five students is 150.4 pounds. If no student weights less than 130 pounds and if no two students’ weights are within five pounds of each other, what is the most in pounds, that any one of the students can weight? a) 172 b) 192 c) 202 d) 232 e) It cannot be determined from the information.

  5. Averages If the average (arithmetic mean) of a, b, c, d, and e is 95, and the average of a,b, and e is 100, what is the average of c and d?

  6. Averages The average (arithmetic mean) of a set of 9 numbers is 99. After one of the numbers is deleted from the set, the average of the remaining numbers is 89. What number was deleted?

  7. Averages If, for any numbers a and b, a☼b represents the average of a and b, which of the following MUST be true? i. a☼(a☼a) = a ii. a☼b = b☼a iii. a☼(b☼c) = (a☼b) ☼c a) i. only b) ii. only c) iii. only d) i. and ii only e) i., ii., and iii.

  8. Averages Brigitte’s average (arithmetic mean) on her six math tests this marking period is 75. Fortunately for Brigitte, her teacher drops each student’s lowest grade, thus raising Brigitte’s average to 85. What was her lowest grade? a) 20 b) 25 c) 30 d) 40 e) 50

  9. 10 + a 10 - a 2 2 Averages The average (arithmetic mean) of two numbers is a. If one of the numbers is 10, what is the other number? a) 2a + 10 b) 2a – 10 c) 2(a-10) d) e)

  10. Averages Jordon has taken five math tests so far this semester. If he gets a 70 on his next test, that grade will lower his test average (arithmetic mean) by 4 points. What is his average now? ? a) 74 b) 85 c) 90 d) 94 e) 95

  11. Averages If the average (arithmetic mean) of a, b, and 10 is 100, what is the average of a and b?