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2.4.5 Normal distribution as a model (A-level only)

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Question 43
a.

Describe the Central Limit Theorem and state the condition usually required for its application.

[2]
b.

A boutique apiary produces jars of organic honey. The mass of honey in a jar is a random variable with a known population standard deviation of 4.5 g. A trading standards officer selects a random sample of 81 jars and records the total mass of honey as ∑m=40,230 g\sum m = 40,230\text{ g}∑m=40,230 g.

Determine a 95% confidence interval for the population mean mass, μ\muμ, of honey in the jars.

[4]
c.

Explain why the Central Limit Theorem was necessary for the calculation in part (b).

[1]
d.

The apiary labels the jars as containing an average of 500 g of honey.

Using your confidence interval, evaluate the suggestion that the apiary is under-filling the jars. Justify your answer.

[2]

2.4.5 Normal distribution as a model (A-level only) Questions

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