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2 Unit AS 2: Applied Mathematics

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Question 74

A regression line for monthly electricity cost c c\,c pounds on average temperature t ∘Ct\,^{\circ}\mathrm Ct∘C is c=94.6−2.85tc=94.6-2.85tc=94.6−2.85t, based on winter temperatures from 1 ∘C1\,^{\circ}\mathrm C1∘C to 11 ∘C11\,^{\circ}\mathrm C11∘C.

a.

Interpret the gradient.

[2]
b.

Estimate the cost when t=8t=8t=8.

[1]
c.

Explain why the line should not be used without caution at t=25t=25t=25.

[1]
Markscheme

2 Unit AS 2: Applied Mathematics Questions

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

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