Solve the problem.If the life of a car engine, calculated in miles, is normally distributed, with a mean of 180,000 miles and a standard deviation of 12,500 miles, what should be the guarantee period if the company wants less than 2% of the engines to fail while under warranty?
A. Less than 154,375 miles
B. Less than 169,500 miles
C. Less than 205,625 miles
D. Less than 144,000 miles
Answer: A
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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 = 20
C. x = 1
D. x = 1
Answer the question.Consider the numbers 8, 
, -24, 0, 
, 
, 0.
, 0.15, 0.8413... Which are whole numbers?
A. 8, -24, 0, 
, 0.
, 0.15
B. 8, -24, 0
C. 8, -24, 0, 
D. 8, 0, 
Plot and interpret the appropriate scatter diagram.The table gives the times spent watching TV and the grades of several students. 
Effect of Watching TV on Grades 
A. Effect of Watching TV on Grades
More hours spent watching TV may
reduce grades.
B. Effect of Watching TV on Grades
More hours spent watching TV may
increase grades.
C. Effect of Watching TV on Grades
More hours spent watching TV may
increase grades.
D. Effect of Watching TV on Grades
More hours spent watching TV may
reduce grades.
Use a graphing utility to find the equation of the line of best fit. Round to two decimal places, if necessary.
A. y = 10x - 3 B. y = 9.8x - 2.6 C. y = 9x - 3 D. y = 9.2x - 2.1