SAT Math : Statistics

研究概念、问题& explan示例ations for SAT Math

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前女友ample Questions

前女友ample Question #11 :How To Find Arithmetic Mean

In a certain game, each of five players received a score between 0 and 100 inclusive. If their average (arithmetic mean) score was 50, what is the greatest possible number of the five players who could have received a score of 75?

Possible Answers:

Three

Two

Five

None

Four

正确答案:

Three

前女友planation:

The question tells us that 50 was the average score of the 5 players, which means that 50 = total points / 5. So, the total points scored in the game must be 5 * 50 = 250.

Going through the answer choices, suppose all five players scored 75—then the total points would be 75 + 75 + 75 + 75 + 75 = 375, which is not 250, so five is not the correct answer.

Suppose four of the five players scored a 75—then the total points for players a, b, c, and d would be 75 + 75 + 75 + 75 = 300, and player e would have to score -50 for the total points to equal 250. Since player e's score cannot equal –50 (the problem says that scores are between 0 and 100), four is not the correct answer.

Now suppose that three of the four players scored a 75—then the total points for players a, b, and c would be 75 + 75 + 75 = 225, meaning d + e would have to equal 25 for the total points to equal 250. This scenario is possible in the game, if, for example, player d scored 12 points and player e scored 13 points. Therefore the greatest possible number of the 5 players who could have scored a 75 is three.

前女友ample Question #12 :How To Find Arithmetic Mean

In a certain class, there are are 12 girls and 17 boys. If the average (arithmetic mean) height of the girls isgand the average (arithmetic mean) height of the boys isb, what is the average height of all of the girls and boys in the class?

Possible Answers:

(b+g)/2

29bg

(12g+17b)/29

(b+g)/29

b+g

正确答案:

(12g+17b)/29

前女友planation:

Averages are calculated by the formula: TOTAL SUM FOR THE GROUP/ NUMBER OF ELEMENTS IN THE GROUP. We are told that the average for the 12 girls isgand the average for the 17 boys isb.Our formula for averages tells us thatgGIR =总额LS’ HEIGHTS / 12 and thatb= TOTAL SUM OF BOYS’ HEIGHTS / 17. Rearranging the terms, we see that the TOTAL SUM OF GIRLS’ HEIGHTS = 12gand the TOTAL SUM OF BOYS’ HEIGHTS =17b.

Again using our formula for averages, we see that the average height of all of the boys and girls in the class is given by the TOTAL HEIGHT FOR ALL BOYS AND GIRLS / TOTAL NUMBER OF BOYS AND GIRLS. We know the total height for all boys and girls will be the sum of the total girls' height and the total boys' height, or 12g+17b, and we know that the total number of boys and girls in the class is 12+17=29. Therefore, the average height for all boys and girls in the class is (12g+17b)/29.

前女友ample Question #13 :How To Find Arithmetic Mean

If the average (arithmetic mean) of four consecutive odd integers is 32, what is the value of the least of the four integers?

Possible Answers:

33

21

31

27

29

正确答案:

29

前女友planation:

Four consecutive odd integers can be expressed asn+(n+2)+(n+4)+(n+6), wherenis the least of the integers. If the mean of the 4 integers is 32, then

Satmath468_1

Collect like terms to find

Satmath468_2

Simplifying givesn+ 3 = 32 , meaning thatnmust be 29.

前女友ample Question #14 :How To Find Arithmetic Mean

A class has test results of 98, 86, 72, 88, and 92. What score does Angie have to get on the test in order to make the average a 85?

Possible Answers:

87.2

63

74

90

60

正确答案:

74

前女友planation:

With Angie's score there will be 6 total scores. 60*85(the average) gives a sum of scores as 510. Subtracting the scores of the other students gives a difference of 74. This means that Angie must score a 74 to have the class average be 85.

前女友ample Question #15 :How To Find Arithmetic Mean

If Mary traveled 116 miles on day 1, 130 miles on day 2, 114 miles on day 3. How many miles per day did she average?

Possible Answers:

114

120

115

118

116

正确答案:

120

前女友planation:

To find an average you add all the values and divide by the number of values. 116+114+130 = 360. 360/3 = 120

前女友ample Question #16 :How To Find Arithmetic Mean

The mean of 12, 14, 18, 20, and x is equal to 14. Solve for x.

Possible Answers:

12

14

5

20

6

正确答案:

6

前女友planation:
  1. Set up an equation to find the mean (or average) of the series of numbers. (x + 64)/5 = 14 (64 = 12 + 14 + 18 + 20)
  2. In order to solve for x, first multiply both sides by 5
  3. x + 64 = 70
  4. Subtract 64 from both sides.
  5. x = 6.

前女友ample Question #17 :How To Find Arithmetic Mean

The St. Louis area has the following weather:

Monday High Temperature 76 Low Temperature 51

Tuesday High Temperature 82 Low Temperature 62

Wednesday High Temperature 67 Low Temperature 37

What is the difference between the high temperature average and the low temperature average over the three days?

Possible Answers:

50

25

40

65

75

正确答案:

25

前女友planation:

Average = sum of data points ÷ number of data points

High temperature average = (76 + 82 + 67) ÷ 3 = 75

Low temperature average = (51 + 62 + 37) ÷ 3 = 50

The difference between the two averages is 25.

前女友ample Question #18 :How To Find Arithmetic Mean

In the following set of numbers, the arithmetic mean exceeds the mode by how much?

{2, 2, 4, 8, 10, 12, 20, 30}

Possible Answers:

9

8

6

4

2

正确答案:

9

前女友planation:

The arithmetic mean is defined as:

The sum of a list of values divided by the number of values in the list.

Therefore for this problem, the arithmetic mean is:

(2+2+4+8+10+12+20+30) / 8 = (88/8) = 11

The mode is defined as the value that occurs the greatest number of times in a list of values.

In this case, it would be 2.

Therefore, the arithmetic mean (11) exceeds the mode (2) by 9.

前女友ample Question #19 :How To Find Arithmetic Mean

The average for 24 students on a test is 81%. Two more students take the test, averaging 74% between the two of them. What is the total class average (to the closest hundreth) if these two students are added to the 24?

Possible Answers:

79.12%

80.46%

77.5%

77.44%

81.22%

正确答案:

80.46%

前女友planation:

The easiest way to solve this is to consider the total scores as follows:

Group 1: 81 * 24 = 1944

Group 2: 74 * 2 = 148

Therefore, the total percentage points earned for the class is 148 + 1944 = 2092. The new class average will be 2092/26 or 80.46. (For our purposes, this is 80.46%.)

前女友ample Question #20 :How To Find Arithmetic Mean

Twenty students scored an average of 83% on a test. After three more took the exam, the class average was exactly 84%. Which of the following is a possible set of scores for these three students?

Possible Answers:

72%, 90%, 98%

None of the other answers

84%, 92%, and 96%

92%, 96%, and 98%

88%, 92%, 100%

正确答案:

84%, 92%, and 96%

前女友planation:

Let's think of the exams in terms of 100 points for a 100%. This means that the first 20 students received 20 * 83 or 1660 points.

Now, we must figure out how many points would be necessary for 23 students to have an average of exactly 84%. That would be found using the equation for a mean:

x / 23 = 84 → x = 1932

That means that our 3 students had to get a total of 1932 – 1660, or 272 points. The only answer that matches that among our answers is 84%, 92%, and 96%.

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