# Need help with stats (3)!

• Sep 15th 2010, 05:53 AM
xsyenex
Need help with stats (3)!
Hi everybody,

i would first like to apologise, in case i am posting this under the wrong section, as i am a new member. I am in need of help of some stats questions, please help me by providing answers and if possible, some explanation to it.

Thank you all!

8. The number of requests for assistance received by a towing service is a Poisson
process with rate =4 per hour.
a) What is the probability that exactly 10 requests are received during a particular
2-hour period?
b) If the operators of the towing service took a 30-minute break for lunch, what
is the probability that they do not miss any calls for assistance?
c) How many calls would you expect during their break?

9. A busy restaurant determined that between 6.30 pm and 9.00 pm on Friday nights,
the arrivals of customers are Poisson distributed with an average arrival rate of 3 per
minute.
a) What is the probability that at least 2 minutes will elapse between arrivals?
b) What is the expected amount of time between arrivals? Its standard deviation?
• Sep 15th 2010, 06:09 AM
CaptainBlack
Quote:

Originally Posted by xsyenex
Hi everybody,

i would first like to apologise, in case i am posting this under the wrong section, as i am a new member. I am in need of help of some stats questions, please help me by providing answers and if possible, some explanation to it.

Thank you all!

8. The number of requests for assistance received by a towing service is a Poisson
process with rate =4 per hour.
a) What is the probability that exactly 10 requests are received during a particular
2-hour period?
b) If the operators of the towing service took a 30-minute break for lunch, what
is the probability that they do not miss any calls for assistance?
c) How many calls would you expect during their break?

9. A busy restaurant determined that between 6.30 pm and 9.00 pm on Friday nights,
the arrivals of customers are Poisson distributed with an average arrival rate of 3 per
minute.
a) What is the probability that at least 2 minutes will elapse between arrivals?
b) What is the expected amount of time between arrivals? Its standard deviation?

These begin to look like a pre course test, you should be doing these on your own so that the lecturer can determin what you do and do not know.

CB
• Sep 15th 2010, 06:18 AM
xsyenex
hi captainblack,

these questions are part of my homework assignment, not a test...i am not cheating x(
• Sep 15th 2010, 03:11 PM
mr fantastic
Quote:

Originally Posted by xsyenex
hi captainblack,

these questions are part of my homework assignment, not a test...i am not cheating x(

Which counts towards your final grade ....? Please read the appropriate forum rule (forum rules are stuck at the top of every subforum).