This is simple to figure out:
Add all of those numbers together and then divide it by how many numbers you added up. Use a caculator if you have to.
62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88.60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90
For 77 83 69 72 85 90 95 75 55 45: σ=15.4071
69% of 90= 69% * 90= 0.69 * 90= 62.1
75/90 is 5/6 (in simplest form) or 83.3333333...(you get what I mean I hope)%
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90.
62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88.60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90
For 77 83 69 72 85 90 95 75 55 45: σ=15.4071
For 72 68 64 90 80 84 78 75 76 77: σ=7.4863
Let v be the capacity in milliliters of the 75% solution required then (90 - v) is the required capacity of the 84% solution needed. 75/100v + 84/100(90 - v) = 77/100 x 90 75v + 84(90 - v) = 77 x 90 75v + 7560 - 84v = 6930 9v = 7560 - 6930 = 630 v = 70 : therefore (90 - v) = 20 The mixed solution requires 70ml of the 75% solution and 20ml of the 84% solution to create 90ml of 77% solution.
89+84+90+94+98=455 455/5= 91 91 is the mean.
51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99 !
95-100= a+ 90-94= a 85-89= b+ 80-84= b 75- 79= c+ 70- 74= c 65-69= d <64= f
70, 75, 80, 85, 90 and 95.
69% of 90= 69% * 90= 0.69 * 90= 62.1
75/90 is 5/6 (in simplest form) or 83.3333333...(you get what I mean I hope)%
62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88.
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90.