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SAT Practice Test 2015. The atomic weight of an unknown element, in atomic mass units (amu), is approximately 20% less than that of calcium. The atomic weight of calcium is 40 amu. Which of the following best approximates the atomic weight, in amu, of the unknown element?
A) 8
B) 20
C) 32
D) 48
If the atomic weight of the unknown element is 20% less than that of calcium, than its atomic weight is 80% of the atomic weight of calcium, that is: 80%(40)=0.8(40)=32 amu
Answer: C
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SAT Practice Test 2015. Katarina is a botanist studying the production of pears by two types of pear trees. She noticed that Type A trees produced 20 percent more pears than Type B trees did. Based on Katarina’s observation, if the Type A trees produced 144 pears, how many pears did the Type B trees produce?
A) 115
B) 120
C) 124
D) 173
If Type A trees produced 20 percent more pears than Type B trees did, then:
$TypeA=1.2(TypeB)$
If the Type A trees produced 144 pears:
$144=1.2(TypeB)$
$TypeB=120$
Answer: B
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SAT Practice Test 2015.
Which of the following best approximates the average rate of change in the annual budget for agriculture/natural resources in Kansas from 2008 to 2010?
A) 50,000,000 per year
B) 65,000,000 per year
C) 75,000,000 per year
D) 130,000,000 per year
Answer:A) 50,000,000 per year
B) 65,000,000 per year
C) 75,000,000 per year
D) 130,000,000 per year
Budget 2008: 358,708
Budget 2010: 488,106
Increase in 2 years: 129,398
Average increase per year: 129,398/2=64,699
Answer: B
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SAT Practice Test 2015. This question refers to the budget presented in the previous question.
Of the following, which program’s ratio of its 2007 budget to its 2010 budget is closest to the human resources program’s ratio of its 2007 budget to its 2010 budget?
A) Agriculture/natural resources
B) Education
C) Highways and transportation
D) Public safety
Human Resources 2007: 4,051,050
Human Resources 2010: 5,921,379
Human Resources Ratio: 1,46
Agriculture/natural resources 2007: 373,904
Agriculture/natural resources 2010: 488,106
Agriculture/natural resources Ratio: 1,31
Education 2007: 2,164,607
Education 2010: 3,008,036
Education Ratio: 1,39
Highways and transportation 2007: 1,468,482
Highways and transportation 2010: 1,773,893
Highways and transportation Ratio: 1,21
Public safety 2007: 263,463
Public safety 2010: 464,233
Public safety Ratio: 1,76
Answer: B
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SAT Practice Test 2015.
The data in the table above were produced by a sleep researcher studying the number of dreams people recall when asked to record their dreams for one week. Group X consisted of 100 people who observed early bedtimes, and Group Y consisted of 100 people who observed later bedtimes. If a person is chosen at random from those who recalled at least 1 dream, what is the probability that the person belonged to Group Y?
A) 68/100
B) 79/100
C) 79/164
D) 164/200
Number ot people who recalled at least 1 dream in Group Y: 11+68=79.
Total number ot people who recalled at least 1 dream: 39+125=164.
The probability that the person belonged to Group Y: 79/164.
Answer: C
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SAT Practice Test 2015. A survey was conducted among a randomly chosen sample of U. S. citizens about U. S. voter participation in the November 2012 presidential election. The following table displays a summary of the survey results.
According to the table, for which age group did the greatest percentage of people report that they had voted?
A. 18- to 34-year-olds
B. 35- to 54-year-olds
C. 55- to 74-year-olds
D. People 75 years old and over
Let´s calcule the percentage for each age group:
18- to 34-year-olds: 30329/63008=48%
35- to 54-year-olds: 47085/74282=63%
55- to 74-year-olds: 43075/59998=71%
People 75 years old and over: 12459/17794=70%
Answer: C
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SAT Practice Test. The following question refers to the information and table provided on the previous question.
Of the 18- to 34 year olds who reported voting, 500 people were selected at random to do a follow up survey where they were asked which candidate they voted for. There were 287 people in this follow up survey sample who said they voted for Candidate A, and the other 213 people voted for someone else. Using the data from both the follow up survey and the initial survey, which of the following is most likely to be an accurate statement?
A. About 123 million people 18 to 34 years old would report voting for Candidate A in the November 2012 presidential election.
B. About 76 million people 18 to 34 years old would report voting for Candidate A in the November 2012 presidential election.
C. About 36 million people 18 to 34 years old would report voting for Candidate A in the November 2012 presidential election.
D. About 17 million people 18 to 34 years old would report voting for Candidate A in the November 2012 presidential election.
287 people out of 500 people of the 18- to 34 year old age group said they voted for Candidate A. That is about 57% of this sample.
57% out of 30,329,000 people is about 17 million people.
Answer: D
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