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.
If the mean is 71, which number could u be?
74 u 83 69 69 69 69
85
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
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.
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, 88.60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90
75
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.
95-100= a+ 90-94= a 85-89= b+ 80-84= b 75- 79= c+ 70- 74= c 65-69= d <64= f
51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99 !
89+84+90+94+98=455 455/5= 91 91 is the mean.
70, 75, 80, 85, 90 and 95.
69% of 90= 69% * 90= 0.69 * 90= 62.1
62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88.
75/90 is 5/6 (in simplest form) or 83.3333333...(you get what I mean I hope)%