Ononot — A researcher uses PPS sampling to select n = 2 units from a

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A researcher uses PPS sampling to select $n = 2$ units from a population of $N = 5$ . Sizes are $M = \{10, 20, 30, 40, 50\}$ . The total size $M_{total} = 150$ . What is the inclusion probability $\pi_i$ for unit $i=1$ ( $M_1=10$ )?