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PART 2 : PROBABILITY — Statistics STD 12 Commerce — Question

Gujarat BoardEnglish MediumSTD 12 CommerceStatisticsPART 2 : PROBABILITY3 Marks
Question
There are two lifts $($Elevators$) E _1$ and $E _2$ in a multistorey building.
The probability that each one is in working condition is $0.9$. Find probability that,
at any point of time,
$(1)$ Only one of the lifts is in working condition.
$(2)$ Both the lifts are in working condition.
$(3)$ None of the lifts is in working condition.
✓

Answer

$(1)\ 0.18\ (2)\  0.81\  (3)\ 0.01$

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