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

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Question 3

The weight of a bag of sugar, $W$ , is modeled by a normal distribution with a standard deviation of 12 g. It is known that $P (W < 490) = 0.2$ .

Calculate the mean weight of the bags of sugar.

[4]

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 3

The weight of a bag of sugar, $W$ , is modeled by a normal distribution with a standard deviation of 12 g. It is known that $P (W < 490) = 0.2$ .

Calculate the mean weight of the bags of sugar.

[4]

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.