The probability that an electronic device produced by a company does not function properly is equal to 0.1. If 10 devices are bought, then the probability, to the nearest thousandth, that 7 devices function properly is
A. 0.057
B. 0.478
C. 0.001
D. 0
M FOR MATHS
Tuesday, December 14, 2010
Question 20
When a metallic ball bearing is placed inside a cylindrical container, of radius 2 cm, the height of the water, inside the container, increases by 0.6 cm. The radius, to the nearest tenth of a centimeter, of the ball bearing is
A. 1 cm
B. 1.2 cm
C. 2 cm
D. 0.6 cm
A. 1 cm
B. 1.2 cm
C. 2 cm
D. 0.6 cm
Question 18
If f(x) is an odd function, then | f(x) | is
A. an odd function
B. an even function
C. neither odd nor even
D. even and odd
A. an odd function
B. an even function
C. neither odd nor even
D. even and odd
Question 17
The exam scores of all 500 students were recorded and it was determined that these scores were normally distributed. If Jane's score is 0.8 standard deviation above the mean, then how many, to the nearest unit, students scored above Jane?
A. 394
B. 250
C. 400
D. 106
A. 394
B. 250
C. 400
D. 106
Question 16
The mean of a data set is equal to 10 and its standard deviation is equal to 1. If we add 5 to each data value, then the mean and standard deviation become
A. mean = 15 , standard deviation = 6
B. mean = 10 , standard deviation = 6
C. mean = 15 , standard deviation = 1
D. mean = 10 , standard deviation = 1
A. mean = 15 , standard deviation = 6
B. mean = 10 , standard deviation = 6
C. mean = 15 , standard deviation = 1
D. mean = 10 , standard deviation = 1
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