How do you find the deviation from the mean for each value not for a whole set of data?

To find the deviation from the mean for each value in a dataset, first calculate the mean by summing all the values and dividing by the number of values. Then, subtract the mean from each individual value: the deviation for a value ( x_i ) is calculated as ( x_i - \text{mean} ). This will give you the deviation for each value, indicating how far each one is from the mean.