I tried letting K G 1 where G is geometric random variable

I tried letting K = G -1 where G is geometric random variable and found the mean to be 1.5 and could not find the variance

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I tried letting K = G -1 where G is geometric random variable and found the mean to be 1.5 and could not find the variance

WELL IF YOU HAVE THE MEAN = 1.5

WE KNOW THAT THE MEAN IS 1/P SO

P = 2/3

AND Q = 1 - 2/3 = 1/3

NOW WE CAN CALCULATE THE VARIANCE

THAT IS

[1/3] / (2/3)^2 = 3/4