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2.4.6 Probabilities using the normal distribution (A-level only)

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Question 4

The shelf life of a specific type of fresh bread is normally distributed.

14% of the loaves spoil in fewer than 3 days. 18% of the loaves stay fresh for longer than 7 days.

Find the mean and standard deviation of the shelf life of the bread.

[6]

Markscheme

2.4.6 Probabilities using the normal distribution (A-level only) Questions

A Level
Maths
2.4.6 Probabilities using the normal distribution (A-level only)

147 exam-style questions on OCR A Level Maths 2.4.6 Probabilities using the normal distribution (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

2.4.6 Probabilities using the normal distribution (A-level only)

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2.4.6 Probabilities using the normal distribution (A-level only)

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Question 4

The shelf life of a specific type of fresh bread is normally distributed.

14% of the loaves spoil in fewer than 3 days. 18% of the loaves stay fresh for longer than 7 days.

Find the mean and standard deviation of the shelf life of the bread.

[6]

Markscheme

2.4.6 Probabilities using the normal distribution (A-level only) Questions

A Level
Maths
2.4.6 Probabilities using the normal distribution (A-level only)

147 exam-style questions on OCR A Level Maths 2.4.6 Probabilities using the normal distribution (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.