passwella.
Menu

WAEC Further Mathematics 2006 Question 25

Question 25

Statistics

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

  1. A.18.91
  2. B.19.74
  3. C.25.63
  4. D.38.23
Show the answer and explanation

Answer: C (25.63)

Explanation

Substitute x = 15: y = 19.33 + 0.42 × 15 = 19.33 + 6.3 = 25.63.