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
Respond to this Question
Similar Questions

English
Tuesday, December 22nd, Fine, 2015 I got up early in the morning. Because I had to go to school, I washed my face quickly and drank warm water. Then with my school bag on my back, I went out. The bus stop is not far away from my 
math
There is a bus stop in front of Luann's house.A bus arrives at the stop every 45 minutes and goes into fown.The first bus comes at 7:15am If the bus trip takes 12 minutes, what is the latest bus Luann can take in order to get to 
Geometry
I'm really stuck with this question can someone please help me. A bus is scheduled to stop at a certain bus stop every 45 minutes. At the end of the day, buses still stop after every 45 minutes, but because delays often occur 
MTH 156
"Emergency Please Help"!!!!! A bus is scheduled to stop at a certain bus stop every 45 minutes. At the end of the day, buses still stop after every 45 minutes, but because delays often occur earlier in the day, the bus is never 
math
two bus start from the same bus stand at 8a.m. one travels at 40km/h and other at 50km/h. the second bus reaches the next stop at 10a.m.How much later will the first bus arrive? 
Math
Yumi walked 2 km to a bus stop to catch the bust to school. The bus arrived straight away and averaged 60km/h for the 5km trip. Yumi's total travelling time was 25 minutes. at what average speed did Yumi walk to the bus stop? The 
PHYSICS
A student is running at her top speed of 4.6 m/s to catch a bus, which is stopped at the bus stop. When the student is still a distance 38.9 m from the bus, it starts to pull away, moving with a constant acceleration of 0.177 
6th grade math
Mya works on Saturdays and then attends a study group. She needs to be home before her younger brother. She walks from work to the study group in 5 minutes. She studies for 40 minutes. She takes 5 minutes to walk to the bus stop. 
math
two buses start from the same bus stand at 8am . one travels at 40km/h and the other at 50km/h . the second bus reaches the next stop at 10am. how much later will the first bus arrive? 
AP Physics
Jack is 12m from the bus and is running towards the bus at a constant 4.0m/s. If the bus accelerates away from the bus stop at .8m/s^2, can he catch the bus? If so where? Vi= initial velocity vf=final velocity a= acceleration