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2 Unit 2: Applied Mathematics A

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Question 5

A first sample of 30 values has mean 20 and standard deviation 5.

A second sample of 20 values is combined with the first. The 50 values together have mean 22 and standard deviation 6.

a.

Find the mean of the second sample.

[3]
b.

Find the standard deviation of the second sample.

[3]
Markscheme

2 Unit 2: Applied Mathematics A Questions

  1. A Level
  2. /Maths
  3. /2 Unit 2: Applied Mathematics A

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