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

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Question 25

A random sample of size $n$ is taken from a population that is normally distributed with mean $25$ and standard deviation $4$ . Find the minimum sample size such that the probability of the sample mean being greater than $27.5$ is less than $1%1\%$ .

[5]

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

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Question 25

A random sample of size $n$ is taken from a population that is normally distributed with mean $25$ and standard deviation $4$ . Find the minimum sample size such that the probability of the sample mean being greater than $27.5$ is less than $1%1\%$ .

[5]

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

Question 25

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

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

Question 25

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