Questions / Quant trading, Execution & microstructure

Expected fill is not full fill

Applied, about 6 minutes. Question T032.

A passive order for 100 shares has a 60% chance of a full fill and otherwise no fill. Under exactly this model, what is expected filled quantity?

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Answer: 60 shares

  1. Expected quantity is 0.6 × 100 + 0.4 × 0 = 60.

Interview shortcut. Expected fill = fill probability × size.

In the app this has a follow-up where one thing about the setup changes. Try the follow-up.

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