# Question

The Johnson family uses a propane gas grill for cooking outdoors. During the summer they need to replace their tank on average every 30 days. At a randomly chosen moment, what is the probability that they can grill out

(a) At least 40 days before they need to replace their tank;

(b) No more than 20 days?

(a) At least 40 days before they need to replace their tank;

(b) No more than 20 days?

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