Let X represent the amount of time till the next student will ...

[dalyningkenk]

Let X represent the amount of time till the next student will arrive in the library parking lot at the university. If we know that the distribution of arrival time can be modeled using an exponential distribution with a mean of 4 minutes (i.e. the mean number of arrivals is 1/4 per minute), find the probability that it will take between 2 and 12 minutes for the next student to arrive at the library parking lot.
 
  A) 0.049787 B) 0.606531 C) 0.656318 D) 0.556744

Question 2

Let X represent the amount of time until the next student will arrive in the library parking lot at the university. If we know that the distribution of arrival time can be modeled using an exponential distribution with a mean of 4 minutes (i.e. the mean number of arrivals is 1/4 per minute), find the probability that it will take more than 10 minutes for the next student to arrive at the library parking lot.
 
  A) 0.329680 B) 0.917915 C) 0.082085 D) 0.670320

[Shshxj]

Answer to Question 1

D

Answer to Question 2

C

[dalyningkenk]

Thanks for the timely response, appreciate it

[frankwu0507]

Gracias!