QCAA Math Methods External 2020 TECH FREE MC

Pulse rates of adult men are approximately normally distributed with a mean of 70 and a standard deviation of 8.

Which of the following choices correctly describes how to determine the proportion of men that have a pulse rate greater than 78?

• Determine the area to the left of z = 1 under the standard normal curve.

• Determine the area to the right of z = 1 under the standard normal curve.

• Determine the area to the right of z = –1 under the standard normal curve.

• Determine the area between z = –1 and z = 1 under the standard normal curve.

If the probability of success in a Bernoulli trial is 0.30, the variance is

• 0.70

• 0.46

• 0.30

• 0.21

The life expectancy (in years) of an electronic component can be represented by the probability density function shown. The probability that the component lasts between 1 and 10 years is

• 0.0010

• 0.100

• 0.900

• 0.990

A test includes six multiple choice questions. Each question has four options for the answer. If the answers are guessed, the probability of getting at most two questions correct is represented by

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• 
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•