Solve the problem.A data set consists of 139 test scores. Over a long period it has been found that the mean and standard deviation for these scores are known and that the scores are normally distributed. How many scores within this data set should lie between the mean and two standard deviations below the mean? Round your answer to the nearest whole number.
A. 47
B. 69
C. 133
D. 66
Answer: D
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Solve using the multiplication principle.-26.4 = -4.4c
A. 2 B. 6 C. 22 D. -22
Solve the problem. Assume the x-axis is horizontal, the positive y-axis is vertical (opposite g), the ground is horizontal, and only the gravitational force acts on the objects. A projectile is fired with an initial speed of 457 m/sec at an angle of 45°. What is the greatest height reached by the projectile? Round your answer to the nearest tenth.
A. 65.9 m B. 52,212.3 m C. 21,311.1 m D. 5327.8 m
Solve the problem.How many liters (L) of a 10% alcohol solution must be mixed with 40 L of a 40% solution to get a 30% solution?
A. 2 L B. 6 L C. 20 L D. 60 L
Write an equation for the piecewise function.
A. f(x) = 
B. f(x) = 
C. f(x) = 
D. f(x) = 