Find the probability of the given event.A bag contains 4 red marbles, 5 blue marbles, and 3 green marbles. A randomly drawn marble is blue.
A. 
B. 
C. 
D. 
Answer: C
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Test scores are normally distributed with a mean of 500. Convert the given score to a z-score, using the given standard deviation. Then find the requested percentage.Find the percentage of students who score below 635 if the standard deviation is 90.
A. 6.68% B. 90% C. 93.32% D. 56.68%
Find an equation for the line with the given properties.Perpendicular to the line 
; containing the point (5, 4)
A. y = - 
x - 
B. y = - 7x - 39
C. y = - 7x + 39
D. y = 7x - 39
Find the value of the expression without using a calculator.62 log6 3 + log6 2
A. 6 B. 12 C. 18 D. 11
Solve the problem.A study was conducted to compare the average time spent in the lab each week versus course grade for computer students. The results are recorded in the table below. Use the equation of the least squares line to predict the grade of a student who spends 20 hours in the lab. Number of hours spent in lab (x) Grade (percent) (y) 10 96 11 51 16 62 9 58 7 89 15 81 16 46 10 51
A. 47.4% B. 55.4% C. 51.4% D. 68.6%