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Internet service: An Internet service provider sampled $50 customers and found that 72 of them experienced an interruption in high-speed service during the previous month. Part: 0 / 3 Part 1 of 3 (a) Find a point estimate for the population of all customers who experienced an interruption. Round the answer to at least three decimal places. The point estimate for the population proportion of all customers who experienced an interruption is Part: 1 / 3 Part 2 of 3 (b) Construct a 99.9 % confidence interval for the proportion of all customers who experienced an interruption. Round the answer to at least three decimal places. A 99.9 % confidence interval for the proportion of all customers who experienced an interruption is p