Question 5.322

109. Mobile YouTube Watchers. YouTube reports that 40% of users access YouTube with a mobile device.

  1. Find the probability that two randomly selected YouTube watchers are using mobile devices.
  2. Find the probability that three randomly selected YouTube watchers are all using mobile devices.
  3. Find the probability that five randomly selected YouTube watchers are all using mobile devices.
  4. Find the probability that at least one of four randomly selected YouTube watchers is using a mobile device.

5.3.109

(a) 0.16 (b) 0.064 (c) 0.01024 (d) 0.8704