Estimate the mean ACT score and standard deviation from this frequency table.
ACT Score
No. making score
21-23
25
24-26
40
27-29
70
What will be an ideal response?
Mean 
, 
Mathematics
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Find the unknown number in the proportion. Write your answer as a whole number or a mixed number if possible.
= 
A. x = 
B. x = 7
C. x = 
D. x = 1
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Find the product or quotient.
? 
A. 
B. 
C. 
p
D. 
p
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Solve and check.
- 
= 0
A. 
B. 
C. 
D. 
Mathematics
Solve.There are currently 67 million cars in a certain country, decreasing by 1.3% annually. How many years will it take for this country to have 47 million cars? (Round to the nearest year.)
A. 15 years B. 20 years C. 27 years D. 230 years
Mathematics