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Mathematics: AA HL

Paper 2

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Mathematics: AA HL

Available time 20 Minute(s)

The following table shows the average weights for given heights at a fitness challenge.

Write down the quadratic expression 3x²-5x-2 in the form (ax-b)(x+c).

Paper 2

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Available time 20 Minute(s)

01. Question

Level Medium

Maximum Mark 7

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The following table shows the average weights (y kg) for given heights (x cm) at a fitness challenge.

Give your answers in three significant figures.

(a). The relationship between the variables can be modelled by the regression equation $y = a x + b$
(i) Write down the value of a

[Marks: 1]

(ii) Find the value of b.

[Marks: 1]

(iii) Hence estimate the weight, in kg, for height $165 cm$ .

[Marks: 2]

(b). (i) Write down the correlation coefficient.

[Marks: 2]

(ii) Interpret the correlation between the variables.

[Marks: 1]

weak positive

strong negative

no correlation

strong positive

End Test