Step-by-step explanation:
0.75 falls between 0 and 1; divide the interval between 0 and 1 into four equal parts, and count three parts from 0; mark that point as 0.75;
0.4 falls between 0 and 1; divide that interval into ten equal parts, and count four parts from 0; mark that point as 0.4;
0.15 falls between 0 and 1; divide that interval into twenty equal parts, and count three parts from 0; mark that point as 0.15;
Just connect those dots and you will have your line. Hope this helped.