STAT-discrete random varaibles

a driver passes 4 sets of traffic lights. the random varaible X is the number of traffic lights he has to stop at. the probabilty distribution for x is given:

x 0 1 2 3 4
prob 0.1 0.2 0.3 0.2 0.2

a) find the upper quartile of the number of traffic lights at which the driver has to stop for on a single trip ?

b) The total travel time (T) is the driving time plus the waiting time at traffic lights. The driving time for the trip is 13 minutes and the waiting time at each set of lights the driver has to stop at is 2 minutes. Give an equation relating the total travel time to the
driving time and the number of traffic lights stopped at ?

c) What is the probability that the total trip time is less than 18 minutes?

d) What is the probability that the total trip time is less than 18 minutes?

take a shot. what do you think are the answers?

  1. 👍 0
  2. 👎 0
  3. 👁 176
asked by mick

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    A MASS OF A MINUBUS WITH THE DRIVER IS 1 500Kg .ASSUME THAT THE PASSENGERS HAV AN AVERAGE MASS OF 50Kg EACH .THE DRIVER IS MOVING AT A SPEED OF 30m.s WHE HE NOTICES THAT THE TRAFFIC LIGHTS AHEAD TURNED TO RED .HE APPLIES A FORCE

    asked by VICTOR MACMILLAN on February 7, 2012
  2. Physics

    The mass of a minibus with the driver is 1.50×10^3 kg.Assume that the passengers have an average mass of 50.0kg each.The driver is moving at a speed of 30.0m.s^-1 when he notices that the traffic lights ahead have turned to

    asked by Hasidiah on February 7, 2016
  3. physical Science

    The Mass Of A Minibus with The Driver is 1500 kg.the Driver Is Moving At A Speed Of 30 m.s When He Notices That The traffic light Ahead Have turned To red.he Applies A Force Of 9000N on the brake pedal. A)calculate his

    asked by vuyo on March 10, 2013
  4. physics

    The stoplights on a street are designed to keep traffic moving at 37 mi/h. The average length of a street block between traffic lights is about 80 m. What must be the time delay between green lights on successive blocks to keep

    asked by diego on September 19, 2019
  5. Physics

    The stoplights on a street are designed to keep traffic moving at 34 mi/h. The average length of a street block between traffic lights is about 80 m. What must be the time delay between green lights on successive blocks to keep

    asked by Joe on August 20, 2015
  6. Physics

    The stoplights on a street are designed to keep traffic moving at 34 mi/h. The average length of a street block between traffic lights is about 80 m. What must be the time delay between green lights on successive blocks to keep

    asked by Elsa on August 20, 2015
  7. physics

    When I was traveling at 18m/s with my bike I approach traffic lights when I was 30m far from them they turned red and it took me to recognize and react by applying breaks then I decelerated to 4.6m/s2. How will I go and in which

    asked by jared on January 13, 2017
  8. physics

    Consider a horizontal road with such a set of traffic lights, each spaced 100 m apart. A car sits at the first traffic light. At t=0 the light turns green and the car accelerates. What is the maximum time t in secondsthe

    asked by stranger on May 27, 2013
  9. statistic

    A student must pass through 12 sets of traffic lights on his way to university. Suppose that each of the lights is green 39.5% of the time, yellow 5.9% of the time, and red 54.6% of the time. Suppose also that the traffic lights

    asked by finn on November 6, 2014
  10. Physics

    A car of mass 1300 kg is driving along a road at speed of 28m/s. As it approaches some traffic lights, the lights change to red and the driver applies his brakes causing the car to skid. The frictional force between the skidding

    asked by Sean on October 25, 2015

More Similar Questions