What is the mean of this

15, 16, 15, 13, 19, 20, 21

what is the answer?

A: 15

B: 16

C: 17

D: 18

Answer; C, 17

Step-by-step explanation: add all the numbers and divide by 7

10.416 meters per second

step-by-step explanation:

distance=1 00 meters

time= 9.6 seconds in decimal form or 9 3/5 as a mixed number

average speed= 100/9.6

=10.416 meters per second or 10 52/125 as a mixed number.

what is the question? i am guessing you are looking for the area.

to find an area, you have to do length x width.

in this case, it would be 12 ft x 4 ft = 48 sq. ft