Find the probability using exponential distribution

Reference no: EM1316363

Find the probability using exponential distribution.

The Johnson family uses a propane tank for cooking on their gas grill. 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? (Round your answer to 4 decimal places.)

(b) No more than 20 days? (Round your answer to 4 decimal places.)

Reference no: EM1316363

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