The Johnson family uses a propane gas grill for cooking outdoors. During the sum

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, determine the following:

What is the probability that they can grill out at least 34 days before they need to replace their tank? (Round your answer to 4 decimal places.)

What is the probability that they can grill out no more than 15 days? (Round your answer to 4 decimal places.)

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, determine the following:

Explanation / Answer

a) Here Parameter is 1/30

P( X>=34)

Use excel function

1-EXPON.DIST(33,1/30,TRUE)

= 0.3329

b) P(X<=15)

Use excel function

EXPON.DIST(15,1/30,TRUE)

= 0.3935

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