Question

According to the data, what is the best prediction for the age at which a person will receive anaverage of 12 text messages a day?A. 50 years oldOB. 55 years oldOC. 59 yearsD. 62 years old

Answer 1

Consider that the equation of a striaght line passing through two points is given by,

`y-y_1=(y_2-y_1)/(x_2-x_1)*(x-x_1)`

Consider that the best fit line of the scatter plot passes through (20,50) and (30,40).

So the equation of the best fit line is given by,

`\begin{gathered} y-50=(40-50)/(30-20)*(x-20) \\ y-50=-1(x-20) \\ y-50=-x+20 \\ y=70-x \end{gathered}`

Here in this question, 'y' represents the number of text messages while 'x' gives the age of the person