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Year 12 Specialist (Unit 3 & 4) Statistical inference

The distribution of the sample mean for other random variables

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Questions
Question 1
163549

The average life of a particular brand of a light bulb is 800 hours and has a standard deviation of 120 hours. What is the probability that the average life of a sample of 36 bulbs is less than 780 hours?

\(0.1587\)

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