I have a question for https://www.khanacademy.org/math/statistics-probability/sampling-distributions-library/sample-proportions/v/sampling-distribution-of-sample-proportion-part-1?modal=1 where in order to calculate the mean of sample proportion of sampling distribution the formula suggested is

mean of Sample Proportion = (n*p)/n - Equation (1)

I have confusion around why  (n*p)/n is suggested to calculate mean of proportion.

I meant to say, as a novice, the arithmetic mean is (sum of all observation/number of observations). So applying this to mean of sample proportion, it could be written as

mean of Sample Proportion = sum of all p(hats) / M - Equation (2)

where M is the number of samples taken from population and p(hat) is the proportion calculated from each sample. 

I am unsure how to reconcile Equation(1) with Equation (2). Any help?