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Given the random variable x ~ B (6,1 / 3), what is V (x) equal to?
Random variable x ~ B (6,1 / 3),
Then n = 6, P = 1 / 3, q = 2 / 3,
Then V (x) = NPQ = 4 / 3
2 (x + 1) equals 6 4 (x-1) equals 1-x 3 - (1 + 2x) equals - 23 (2x-1) - 2 (1-x)
2 (x + 1) equals 6
4 (x-1) equals 1-x
3 - (1 + 2x) equals - 2
3（2x-1）-2（1－x）＝0
2 1 2 1/8
[1 + (2X-4) / (x + 1) (X-2)] / [x + 3 / x2-1] where x equals 6
[1+﹙2x-4﹚/﹙x+1﹚﹙x-2﹚]÷[x+3/x²-1]
=[1+2/(x+1)]×(x²-1)/(x+3)
=(x+3)/(x+1)×(x+1)(x-1)/(x+3)
=x-1
=6-1
=5
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