It appears that the image attached is plotting the deviation of grain diameter from a certain value. Assuming that the deviation is measured with respect to the mean, here the implementation for your requirements.
% Sample data: grain diameters
grain_diameters = 50 + 10 * randn(1000, 1);
% Calculate the mean of the grain diameters
mean_diameter = mean(grain_diameters);
std_diameter = std(grain_diameters);
% Calculate the deviation from the mean
deviation_from_mean = grain_diameters - mean_diameter;
% Plot histogram of the deviations
histogram(deviation_from_mean);
% Add labels and title
xlabel('Deviation in Grain Diameter wrt Mean');
ylabel('Weight Percentage');
title('Histogram of Grain Diameter Deviations');
% Remove xtick labels and get the values of xticks
set(gca,'xticklabel', [])
xTicks = get(gca, 'xtick');
% Store the value of the desired xtick label in the cell array XTickString
for iXTick = 1:length(xTicks)
XTickString{iXTick} = ['$$\begin{array}{c}' num2str(xTicks(iXTick)) 'mm\\' ...
num2str(xTicks(iXTick)/std_diameter) '\sigma\\' '\end{array}$$'];
end
% Set the value for xtick label to the cell array and use the latex
% interpreter to effectively display the desired results
set(gca,'XTickLabel',XTickString,'TickLabelInterpreter','latex');
For more information on multiline "xtick" labels, refer to this MATLAB Answer: https://www.mathworks.com/matlabcentral/answers/101922
