Four students from each of the grade levels 4 through 8 at Wilson School were selected at random and surveyed about the number of books they read. The scatterplot above shows the number of complete

independent-reading books, y, that each of the 20 students read during the last school year. A line of best fit

for the data is also shown and has the equation of y = 2x + 4, where x is the grade level of the student.

The mean number of independent-reading books read by the 4 eighth-grade students shown in the

scatterplot is the same as the mean number of independent-reading books read by all 62 eighth-grade

students in the school last year. In total, how many independent-reading books were read by all eighth-

grade students at Wilson School during the last school year?

is there answer choices?

idk

step-by-step explanation:

answer: c, the green line

step-by-step explanation:

there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.

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step-by-step explanation: