Nothing
m <- 5/(2+5); m # mean
v <- 5 * 2 / ( (5+2)^2 * (5 + 2 + 1) ); v # var
qbeta(0.5,5,2) # median
pbeta(m,5,2) # less than mean
pbeta(0.4,5,2) - pbeta(0.2,5,2) # in a range
pbeta(m+sqrt(v), 5, 2) - pbeta(m-sqrt(v), 5, 2) # near mean
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