Question 22

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

Question 21

The period of 2 sin x cos x is 

A. 4 pi ²
B. 2 pi
C. 4 pi
D. pi

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

Question 19

The period of | sin (3x) | is 

A. 2 pi
B. 2 pi / 3
C. 4 pi / 3
D. 3 pi

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

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

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