Answer:
5.571349 x 10^3
or
5571.349
7(x-1)-5(x-1)= 22
7x-7-5x+5= 22
7x-5x-7+5 = 22
2x-2= 22
2x = 22+2
2x = 24
x = 24/2
x = 12
Step-by-step explanation:
The 99.87th percentile, or the area to the left of the 3 standard deviation mark it 99.87% better than everyone/everything else.