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

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Question 15

The 100m race times an athlete records are normally distributed.
16% of the time the athlete is faster than 10 seconds.
23% of the time the athlete is slower than 11 seconds.

Find the mean and standard deviation of the times.

[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 15

The 100m race times an athlete records are normally distributed.
16% of the time the athlete is faster than 10 seconds.
23% of the time the athlete is slower than 11 seconds.

Find the mean and standard deviation of the times.

[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.