Maths-
SAT
Easy
Question
f(x) = -0.5x + 56
The given function models the average daily temperature f(x), in degrees Fahrenheit (˚F), in Chicago x days after November 1, for 0 ≤ x ≤ 29. Based on this model, what is the average daily temperature, in ˚F, in Chicago 6 days after November 1?
- 62
- 60
- 56
- 53
The correct answer is: 53
f(x) = - 0.5 x + 56
f(x) is average daily temperature in degrees in chicago x days after november 1
The temperature in chicago 6 days after november 1.
6(6) = - 0.5 
6 + 56
= - 3 + 56 = 53.
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|
Score range |
Study I |
Study II |
Study III |
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50 |
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100 |
200 |
300 |
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• For Study II, 200 tenth graders were selected at random from all tenth graders in Mistwick.
• For Study III, 300 tenth graders from Mistwick volunteered to participate.
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|
Score range |
Study I |
Study II |
Study III |
| 50-59 |
24 |
50 |
88 |
| 60-69 |
36 |
67 |
67 |
| 70-79 |
22 |
52 |
65 |
| 80-89 |
11 |
14 |
41 |
| 90-100 |
7 |
17 |
39 |
| Mean score |
68.6 |
68.7 |
70.4 |
| Total number of participants |
100 |
200 |
300 |
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• For Study II, 200 tenth graders were selected at random from all tenth graders in Mistwick.
• For Study III, 300 tenth graders from Mistwick volunteered to participate.
No tenth grader participated in more than one of the three studies.
The results of which of the studies can appropriately be generalized to all tenth graders in Mistwick in spring 2015?
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