2025 IGCSE 0580 February/March P42 Q7

2025 IGCSE 0580 February/March P42 Q7

5 marks

The table shows the age and mass of each of \(10\) babies.

Age (weeks)\(9\)\(12\)\(15\)\(2\)\(5\)\(6\)\(9\)\(7\)\(1\)\(11\)
Mass (kg)\(4.3\)\(5.8\)\(6.2\)\(3.0\)\(3.9\)\(4.0\)\(4.6\)\(4.5\)\(2.5\)\(5.3\)
  1. Complete the scatter diagram.
    The first six points have been plotted for you.[2]
  2. What type of correlation is shown in the scatter diagram?[1]
  3. On the scatter diagram, draw a line of best fit.[1]
  4. Use your line of best fit to find an estimate of the mass of a \(14\)-week old baby.[1]

Solution:

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Answer:(a) Plot \((9,4.6),(7,4.5),(1,2.5),(11,5.3)\). (b) Positive. (c) A suitable straight line of best fit. (d) About \(6.2\text{ kg}\).

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