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STA1010 - Statistical methods for science - S2 2025

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Find the percent of a standard Normal model found in the given region:

z < 1.90

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The time to complete an on-line quiz for a randomly chosen student in a statistics class is a normal random variable with a mean of 45 minutes and a standard deviation of 10 minutes.

What percent of the class will have finished the quiz by 60 minutes?

State your answer, as a percentage, to only one(1) decimal place.

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Cholesterol levels of adult women have a mean of 188 mg/dL with standard deviation of 24.

Vesna has a cholesterol level of 150 mg/dL.

Find her standardised cholesterol level, correct to TWO decimal places.

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Find the percent of a standard Normal model found in the given region:

z > 0.59

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The lengths of human pregnancies can be described by a Normal model with a mean of 268 days and a standard deviation of 15 days.

What percentage can we expect for a pregnancy that will last at least 300 days?

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In a standard Normal model, state what value(s) of z cuts off the described region:

the highest 7%

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The z-score above which 0.5% of a normally distributed population exists, z0.005 , is closest to

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

Which choice correctly describes how to find the proportion of men that have a pulse rate greater than 78?

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