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The equation of the line of best fit for variables x and y is \(y...

Further Mathematics
WAEC 2006

The equation of the line of best fit for variables x and y is \(y = 19.33 + 0.42x\), where x is the independent variable. Estimate the value of y when x = 15.

  • A. 18.91
  • B. 19.75
  • C. 25.63
  • D. 38.23
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Correct Answer: Option C
Explanation

\(y = 19.33 + 0.42x\)

\(\text{The value of y when x = 15} = 19.33 + (0.42 \times 15)\)

= \(19.33 + 6.30\)

= 25.63


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