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2.4.2 The Normal distribution (A-level only)

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Question 5

A random sample of size $n\,$ is taken from a population that is Normally distributed with mean 25 and standard deviation 4.

Find the smallest value of $n\,$ for which the probability that the sample mean is greater than 27.5 is less than 1%.

[6]

Markscheme

2.4.2 The Normal distribution (A-level only) Questions

A Level
Maths
2.4.2 The Normal distribution (A-level only)

351 exam-style questions on AQA A Level Maths 2.4.2 The Normal distribution (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

2.4.2 The Normal distribution (A-level only)

Question bank

2.4.2 The Normal distribution (A-level only)

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Question 5

A random sample of size $n\,$ is taken from a population that is Normally distributed with mean 25 and standard deviation 4.

Find the smallest value of $n\,$ for which the probability that the sample mean is greater than 27.5 is less than 1%.

[6]

Markscheme

2.4.2 The Normal distribution (A-level only) Questions

A Level
Maths
2.4.2 The Normal distribution (A-level only)

351 exam-style questions on AQA A Level Maths 2.4.2 The Normal distribution (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.