Help This dot plot shows scores on a recent math assignment.
Find the measures of central tendency and variability.

Mean:
Median:
Mode:
Range:

Mean:7.7

Median:8

Mode:8

Range:4

Step-by-step explanation:

mean is the same thing as average so we can do 5+(6x2)+(7x4)+(8x8)+(9x5) witch is 5+12+28+64+45=154  154/20= 7.7

medain is the average of the 2 numbers in the and there are 20 dots between    

so since the 2 middle numbers are 8 and (8+8)/2=8 \

mode is the most common and since there are the most 8's out of every number 8 is the mode

range is the biggest minus the smallest since the biggest is 9 and the smallest is 5 9-5=4

14

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.