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# Data Analytics Online Tutor

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## Falid B

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Data Analysis
function BSA = BodySurA(w,h) % calculate BSA in m^2 % where h is in cm and W is in KG h = h .* 0.3937 ; % converts cm to inches w = w .* 2.2046 ; % converts KG to lb BSA = sqrt( h .*w/3131 ) end % reads data from given spreadsheet data = xlsread('PersonalInfo (1).xls'); ID = data(:,1); Gender = data(:,2); Height = data(:,3); Weight = data(:,4); BSA = BodySurA(Weight,Height); % calculate the average BSA for Male group idxMale = find(Gender==0); BSAMale = BSA(idxMale); AverageBSAMale = sum(BSAMale)/length(BSAMale) fprintf('The average BSA for male group is %1.4f', AverageBSAMale) % calculate the average BSA for Female group idxFemale = find(Gender==1); BSAFemale = BSA(idxFemale); AverageBSAFemale = sum(BSAFemale)/length(BSAFemale) fprintf('The average BSA for female group is %1.4f', AverageBSAFemale) 
Solving Equations Using Matlab
clc, clear all, close all %% Question 1 syms x y z %% Question 2 fprintf("\n\nQuestion 2:\n"); % let's solve using symbolic solver xsol = double(solve(x^4 + 2*x^3 - 8*x^2 - 9*x+18==0)) %% Question 3 fprintf("\n\nQuestion 3:\n"); xsol = double(solve(x^3 - 5*x^2 == -x-15)) %% Question 4 fprintf("\n\nQuestion 4:\n"); % The intersection points are the solutions of the equation sol = solve([4*x^2+5*(y-1.5)^2 == 40;y-3*x+1==0], [x,y]); xsol = double(sol.x) ysol = double(sol.y) %% Question 5 fprintf("\n\nQuestion 5:\n"); % Define the system of equations equations = [2.1*x+6.2*y-3.1*z==205; -3.7*x+10.8*y+1.1*z == -107; x+2*y-3*z==23]; sol = solve(equations, [x,y,z]); xsol = double(sol.x) ysol = double(sol.y) zsol = double(sol.z) %% Question 6 fprintf("\n\nQuestion 6:\n"); % We will use x = F1 and y = F2 equations = [(1 + cosd(30))*x + 10.3*cosd(25)*y == 0; 5*sind(30)*x - 5.6*sind(25)*y == 30]; sol = solve(equations, [x,y]); F1 = double(sol.x) F2 = double(sol.y) %% Question 7 fprintf("\n\nQuestion 7:\n"); y(x) = tan(4-3*x)-sqrt(3); % Now solve xsol = double(solve(y(x)+2*x==7, x)) %% Question 8 fprintf("\n\nQuestion 8:\n"); clear y syms y z1(x,y) = 4*x^2+5*(y-1.5)^2 -40; z2(x,y) = y-3*x+1; % The intersection points are where z1== z2 sol = solve(z1==z2, [x,y]); xsol = double(sol.x) ysol = double(sol.y) %% Question 9 fprintf("\n\nQuestion 9:\n"); % We will use x and y as our variables % Define first equation eq1 = x+y == 11; % the sum of both numbers is 11 eq2 = 10*y+x + 27 == 10*x+y; sol = solve([eq1;eq2], [x,y]); number = double(10*sol.x + sol.y) %% Question 10 fprintf("\n\nQuestion 10:\n"); d = 250; %from A to B va = 60; vb = 0; ab = -20; aa = 0; % Equation for position of a: eq1 = va*x + aa*x^2 /2; eq2 = d + vb*x + ab*x^2 /2; sol = solve(eq1 == eq2) t = double(sol); t = t(t > 0); % take only the positive value Xa = double(va*t + aa*t^2 /2) Xb = double(vb*t + ab*t^2 /2) fprintf("The trains met when they are at at distance of %.3f of station A\n", Xa)