`sum_(n=1)^18(x_i-alpha)=36 , sum_(n=1)^18(x_i-beta)^2=90` where `alpha and beta ` are distinct and the standard deviation of `x_i` is `1` then Find `abs(beta-alpha)`

Let X_1,X_2,….,X_(18) be eighteen observations such that sum_(i=1)^(18)(X_i-alpha)=36 and sum_(i=1)^(18)(X_i-beta)^2=90 , where alpha and beta are distinct real number. If the standard deviation of these observations is 1 then the value of |alpha-beta| is "_____"

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