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5. You work on the 13th floor of a 15-floor building. The only elevator moves continuously back and forth between floors 0 through 15 and stopping time at each floor is negligible (a) You find it irritating that every time you want to go home for the day, the elevator is almost always going up when it arrives at your floor. What is the explanation for this? Compute the probability of this occurring. (b) Write the expected value of the amount of time that you must wait alllllines 1 had ilu, «-Irv; ini. HRoves a1.ณ 1zat.e: for the «Irvani.or lo arrive, of one floor per minute

math   Statistics-And-Probability   
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Answer #1

5 Ther as tota s ot and or 13 up douun 尘一レ- ー2 4 . 12 oing Up otal (asas 3o 1b lt 19 D movin 21-D! 3 2 2.2 2 2 2 23 2-2- 0 Lo £-> ←个个个 个! 丕个 う「P. C elavdan going- up)-= .24, 30 = 13 p ( elevator going-daun)-LB- 2 So inding both the Probralriithies IS asy to say that he ebevator iadmest ahu ging up, caus Probability, 어 gointur Amay quoata tah its going dour. for Expectad vake othe aroud et time we hav1わ calculate -finu_ Mom ach Hoo and 18 minuto10 have made the talbeonthe right side all the Hoor 1St クEyeded Arno unt 아 time= Sumot aatin 30 LTota 30 ! S. S-minutes ニ.

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