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A-box-contains-12-balls-numbered-from-1-to-12-4-balls-are-selected-successively-without-replacement-Given-X-the-variable-the-number-of-even-numbered-balls-selected-Determine-the-probability-typ




Question Number 105934 by Ar Brandon last updated on 01/Aug/20
A box contains 12 balls numbered from 1 to 12. 4 balls  are selected successively without replacement. Given  “X” the variable “the number of even numbered balls  selected”. Determine the probability type/law of X.
Aboxcontains12ballsnumberedfrom1to12.4ballsareselectedsuccessivelywithoutreplacement.GivenXthevariablethenumberofevennumberedballsselected.Determinetheprobabilitytype/lawofX.
Answered by bobhans last updated on 01/Aug/20
even number = { 2,4,6,8,10,12}  p = (6/(12)) = (1/2). P(X=x) = Σ_(x=0) ^4 C _x^4  ((1/2))^x ((1/2))^(4−x)
evennumber={2,4,6,8,10,12}p=612=12.P(X=x)=4x=0Cx4(12)x(12)4x
Commented by Ar Brandon last updated on 01/Aug/20
OK. But I felt the probability of selection on each trial  isn′t same.
OK.ButIfelttheprobabilityofselectiononeachtrialisntsame.

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