I need help with predicting future values of signal using average, and moving average method?

Hi guys, thank you in advance for any help. I have my final paper to write on theme: Estimation of Future Values in Continuous Glucose Monitoring Data. I uploaded here file samples.mat I have problem with doing this in matlab. Table samples.mat contains 2 columns. First has 12x1 array with 12 glucose values (1 value/5min), in total one hour of data. Other column is 6 future values of signal in first column (next half hour data). I need to determine future 6 values of every row in table samples.mat using data from every cell in first column a) using just average of previous values b) using Moving average trend estimation(https://www.mathworks.com/help/econ/moving-average-trend-estimation.html) and i got this link from my profesor but i cant seem to figure it out how to get future values and show them on plot.

- which valuse to use as x axis in plot? time hour, hour and half, or number of samples?? - how to do this in a). i got 6 future values by calculating average of first 12, then added average value in new column/row of that array, then used 12 values and 13th value to calculate next average value, but i get same average all the time (every row of samples table diffferent average)

if true
  load('samples.mat');
load('similarsSorted.mat');
%simple average
f=[];
for i=1:32
  newCol = samples{i};
     for j= 1:6 
          avg = mean(newCol);
          newCol =[newCol; avg]; 
     end 
      f =[f newCol];  
end
title('Normal average data');
plot(f);
end

this is content of my .m file for a).

Please help, I have deadline till friday and my profesor isnt answering on any of my emails. I need help with figuring out if a) is ok or if it can be written better and with getting idea how to do b) using moving average because i have little experience with matlab syntax.

thank you again, Anamaria