13. My mom calls me a lot. Lets assume that the time between her calls is exponentially distributed with a mean time between calls of 200 minutes. a. What is the probability that there are no calls within a 90-minute interval? SEP L LILL b. What is the probability that at least one call within a 120-minute interval? 2005-200 70922- 2015-201

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Please help me solve this statistics problem from my lecture. Thank you.
13. My mom calls me a lot. Lets assume that the time between her calls is exponentially
distributed with a mean time between calls of 200 minutes.
a. What is the probability that there are no calls within a 90-minute interval? SEP
b. What is the probability that at least one call within a 120-minute interval?
500
2001-200
15
15-05-20
Transcribed Image Text:13. My mom calls me a lot. Lets assume that the time between her calls is exponentially distributed with a mean time between calls of 200 minutes. a. What is the probability that there are no calls within a 90-minute interval? SEP b. What is the probability that at least one call within a 120-minute interval? 500 2001-200 15 15-05-20
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