Question

The equation y = 6.3x + 67.4 is the equation of a linear model in a scatter plot comparing the ages of boys between 2 and 10 years old open (x) and their average heights in centimeters open (y).

What is the average height of a 5-year-old boy?


98.9 cm


78.7 cm


67.4 cm


62.4 cm

Answer 1

Since the age of the boy is represented using x,
when the boy is 5 years old, x = 5.
y = 6.3x + 67.4
= 6.3(5) + 67.4
= 98.9

Since the average height of an age group is represented using y,
when y = 98.9, the average height of a 5-year-old boy is 98.9 cm.

The answer is 98.9 cm.

Answer 2

The average height of a 5 year old baby can be obtained by substituting the x and y values into the regression equation ; Hence, the average height of the baby is 98.9 cm

Given the linear regression equation :

• y = 6.3x + 67.4

• x = age of baby = 5 ; y = height of baby

The average height of a 5 year old baby is thus :

y = 6.3(5) + 67.4

y = 31.5 + 67.4

y = 98.9

Hence, the average height a 5 year old baby will be 98.9cm

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