(Answered) Standard deviation of the number of coffees

Statistics

Dr. Horton is an avid coffee drinker. By observing Dr. Horton on randomly selected days, Dr. Ziggy came to the conclusion that Dr. Horton drinks one "XXXL" coffee on 30% of all days, and two "XXXL" coffees on 70% of all days. Given Dr. Ziggy's finding, let X be a random variable for the number of coffees that Dr. Horton drinks on any given day with the following probability distribution:

X: 12 P(X = x): 0.3 0.7

What is the mean, variance, and standard deviation of the number of coffees consumed per day?
Let ????¯ be a random variable for the sample mean number of coffees consumed over n = 5 randomly selected days. What are the mean and standard deviation of this sample mean?

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