11. find the number of outliers of co2_clean, where the outliers are defined as any value greater than 3 standard deviations from the mean. in matlab

You can use the std and mean functions in Matlab to calculate the number of outliers. Here's an example code snippet assuming that co2_clean is a vector of data:

main.m
% calculate mean and standard deviation
mu = mean(co2_clean);
sigma = std(co2_clean);

% identify outliers as any value more than 3 standard deviations from the mean
outliers = co2_clean > (mu + 3*sigma);

% count the number of outliers
num_outliers = sum(outliers);
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This code calculates the mean and standard deviation of the co2_clean data and then identifies outliers as any value that is more than 3 standard deviations away from the mean. The code then counts the number of outliers using the sum function on the outliers logical vector.