This site explains it: http://www.cs.columbia.edu/~hgs/audio/44.1.html
% rate = 76/400 * 100% = 19%
% Rate = (400/30660) x 100% =1.3%
Stratified Sampling Method Stratified sampling is a probability sampling technique wherein the researcher divides the entire population into different subgroups or strata, then randomly selects the final subjects proportionally from the different strata.
% rate= 85/400 * 100%= 0.2125 * 100%= 21.25%
125%% rate:= 500/400 * 100%= 1.25 * 100%= 125%
% rate:= 400/3800 * 100%= 0.1053* 100%= 10.53%
400/244 in a percentage = 163.93%% rate:=400/244* 100%= 1.6393 * 100%= 163.93%
244-400 as a percentage = 61%% rate:= 244/400 * 100%= 0.61 * 100%= 61%
percent of 400 is 280 = 70%% rate:= 280/400 * 100%= 0.70 * 100%= 70%
18.75%% rate:= 75/400 * 100%= 0.1875 * 100%= 18.75%
74.07%% rate:= 400/540 * 100%= 0.7407 * 100%= 74.07%
380 to 400