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MathML

\begin{aligned} V a r [Z_{c s} (X)] & \approx 4 k^{2} N p (1 - p) + k^{2} [1 - P (X = N p_{0})] - k^{2} {[P (X < N p_{0}) - P (X > N p_{0})]}^{2} \\ + 4 k^{2} [E (X 1_{{X < N p_{0}}}) - E (X 1_{{X > N p_{0}}})] - 4 k^{2} N p [P (X < N p_{0}) - P (X > N p_{0})] \end{aligned}

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Math as LaTeX Source

\begin{align*} \mr{Var} \left[Z_{cs}(X)\right] & \approx 4 k^2 N p (1-p) + k^2 \left[ 1 - P(X = N p_0) \right] - k^2 \left[ P(X<Np_0) - P(X>Np_0) \right]^2 \\ & \quad + 4 k^2 \left[ E\left(X 1_{\{ X<Np_0\} }\right) - E\left(X 1_{\{ X>Np_0\} }\right) \right] - 4 k^2 N p \left[P(X<Np_0) - P(X>Np_0)\right] \\ \end{align*}