Answer:
Mean = (19 + 20 + 21 + 22 + 23)/5 = 105/5 = 21
x x - mean (x - mean)^2
19 -2 4
20 -1 1
21 0 0
22 1 1
23 2 4
Sum = 10
Step-by-step explanation:
Formula = 2nr
= 2(3,14 + 3 + 4)
= 2(10,14)
= 20,28
i think its b
sorry if im wrong..
6.5
