(a) What is the probability that a user spends more than 30 minutes using the app (in a single sitting)? (b) If a user has already spent one hour using the app, what is the probability they will spend at least another 30 minutes using the app? (c) Suppose that 20,000 individuals use the app on any given day, what is the probability that less than 7,500 use the app for less than 18 minutes? Hint: You'll want to approximate a binomial distribution with a normal distribution here.

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