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

b. 24 mm

step-by-step explanation:

use the pythagorean theorem.

a^2 + b^2 = c^2

a^2 + 7^2 = 25^2

a^2 + 49 = 625

a^2 = 576

a = 24

answer: b. 24 mm