PROBABILITY QUESTION, EASY, PLEASE HELP, WILL GIVE BRAINILY AND EXTRA POINTS!!, LINKS AND FAKE ANSWERS WILL BE REPORTED AND BANNED! According to a recent survey, 67% of cell-phone owners find themselves checking their phone for messages, alerts or calls even when they don't notice their phone ringing or vibrating. Suppose wei randomly select 5 cell phone owners at random. Find the probability that all 5 cell-phone owners check their phones even when the phone doesn't ring or vibrate.​

For every corresponding pair of cross sections, the area of the cross section of a sphere with radius r is equal to the area of the cross section of a cylinder with radius and height 2r minus the volume of two cones, each with a radius and height of r. a cross section of the sphere is and a cross section of the cylinder minus the cones, taken parallel to the base of cylinder, is the volume of the cylinder with radius r and height 2r is and the volume of each cone with radius r and height r is 1/3 pie r^3. so the volume of the cylinder minus the two cones is therefore, the volume of the cylinder is 4/3pie r^3 by cavalieri's principle. (fill in options are: r/2- r- 2r- an annulus- a circle -1/3pier^3- 2/3pier^3- 4/3pier^3- 5/3pier^3- 2pier^3- 4pier^3)