Statistics

It takes the bus an average of 20 minutes to arrive at a certain bus stop. A student is waiting for the next
bus to arrive.
a) What is the probability the student waits more than 30 minutes?
b) What is the probability the student waits exactly 15 minutes?
c) What is the probability the student waits more than 45 minutes (total) given they've already waited
20 minutes?
d) Given the student waited less than 45 minutes, what is the probability they waited less than 20
minutes?
e) What is the standard deviation of waiting time?
f) What is the median waiting time?

asked by Sarah
  1. Inadequate data.

    posted by PsyDAG
  2. I think there is enough actually

    posted by Sarah

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