Loop Command and plotting

Ok so I have this script file that will give me 20 x values but only one y value. I need to have 20 of both and plot them accordingly. (x1,y1),(x2,y2),......(x20,y20). I know I'm missing some kind of loop statement but I'm not sure what it is. Any help would be appreciated. Thanks in advance.

clear all;
clc
format compact;
n=20;
x=1:n;
t=60;
for F=('female')
  a= 21;
  w= 115;
  h= randi([153 175]);
  F= ((((a*0.074)-(w*0.05741)+(h*.4472)-20.4022)*t)/4.184);
end
display(F);
for M=('male')
  a=22;
  w=258;
  h=randi([163 184]);
  M= ((((a*.2017)-(w*0.09036)+(h*.6309)-55.0969)*t)/4.184);
end
display(M);
figure;
plot(x,M,'*r',x,F,'k*');
title 'Calories Burned in 60 mins';
xlabel 'Days';
ylabel 'Calories';

[Azzi Abdelmalek]

This is not clear, can you post an example?

[Satyajeet Sasmal]

I do not understand the workflow. Why do you need 20 values of x when you are only generating 4 values for 'male' and 6 values for 'female'? But if you can save the value of F for 'female', you can save 6 values for female and 4 for male. Something like this:

for F=('female')
a= 21;
w= 115;
h= randi([153 175]);
F= ((((a*0.074)-(w*0.05741)+(h*.4472)-20.4022)*t)/4.184);
f(k) = F;
 k = k + 1;
end