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generates a set of numbers which consists of 23 zeros and 17 twos. Find the mean and variance of this set of 40 numbers.

Please help i just don't know where to start. In fact i am thinking of using the formula mean = np but i cannot relate it to the question.

According to the booklet the answer for the mean is 0.850 and variance = 0.978

PLEASE HELP I AM STUCK