Question

7. A scatter plot was created to show the relationship

between the number of staff members and students

at various schools. The scatter plot's trend line has an

equation of y = 0.1x + 18, where y is the total number

of staff members and x is the total number of

students.

Use the equation to predict the number of students in

a school with 120 staff members.

A. 1,038 students

B. 30 students

C. 890 students

D. 1,020 students

Answer 1

1020 students

Explanation:

Given the trend line equation :

y = 0.1x + 18,

where y is the total number of staff members and x is the total number of students.

Using the equation, the predicted number of students in a school with 120 staffs ;

y = 120

y = 0.1x + 18

120 = 0.1x + 18

120 - 18 = 0.1x

102 = 0.1x

x = 102 / 0.1

= 1020 students