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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