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2.5 Data presentation and interpretation

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Question 61

The masses, m m\,m grams, of 40 items are coded using x=m−502x=\dfrac{m-50}{2}x=2m−50​. The coded data have mean 3.5 and variance 4.84.

a.

Find the mean mass.

[1]
b.

Find the variance of the masses.

[2]
c.

Interpret the standard deviation of the masses.

[1]
Markscheme

2.5 Data presentation and interpretation Questions

  1. A Level
  2. /Maths
  3. /2.5 Data presentation and interpretation

278 exam-style questions on CCEA A Level Maths 2.5 Data presentation and interpretation, covering 2.5.1 Data presentation and interpretation, 2.5.2 Data presentation and interpretation, 2.5.3 Data presentation and interpretation, 2.5.4 Data presentation and interpretation, 2.5.5 Data presentation and interpretation, 2.5.6 Data presentation and interpretation, 2.5.7 Data presentation and interpretation, 2.5.8 Data presentation and interpretation, 2.5.9 Data presentation and interpretation, and 2.5 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.

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