(21 + 21 + 19 + 19)/4 = 20
21+21+19+19=80
1.1053
19/21 - 2/7 = 19/21 - 6/21 = 13/21
You could be 12th grade. But many have graduated from high school by 19.
21/19 = 12/19
19/21 is in its simplest form.
The grade is 63.
The variance of 29 21 12 19 19 = 37
she was 19. and for her 21 she was 21.
You get the answer be dividing 19 by 21. That works out to be 90.4%.
21