Course home

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

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]

Markscheme

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

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

79 exam-style questions on OCR (MEI) A Level Maths 2.4.8 Normal distribution as a model (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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

Question bank

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

Medium Hard

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

Question 25

[5]

Markscheme

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

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

79 exam-style questions on OCR (MEI) A Level Maths 2.4.8 Normal distribution as a model (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.