Exercise 1: A Blocker Near the End of the Sprint — Possible Solution
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SETUP
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    BLOCKED_ON_DAY = 8  (changed from the chapter's own 2)

RESULTS
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    WITH standups: surfaced day 8, resolved day 9, 1 day lost
    WITHOUT standups: surfaced day 10, resolved day 11, 2 days lost

    Extra days lost purely from no daily check-in: 1
    Percentage of sprint: 10%

    (chapter's own BLOCKED_ON_DAY=2 result: 7 extra days lost, 70% of sprint)

WHY THE GAP SHRINKS
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Without standups, the blocker is always discovered at the sprint
review - day 10, regardless of when it actually occurred. A blocker
hit on day 2 sits undiscovered for 8 days; a blocker hit on day 8 sits
undiscovered for only 2, simply because there's less remaining sprint
for it to hide within. The "with standups" scenario costs a flat 1 day
regardless of timing, since a daily check-in catches it the same day
either way. The gap between the two scenarios is entirely a function
of how much sprint remains after the blocker occurs - not of the
standup's own effectiveness, which stays constant.

WHY THIS WORKS AS AN ANSWER
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This reveals an important asymmetry the chapter's own single example
(day 2) didn't fully expose: the value of a daily standup is highest
early in a sprint and lowest near the end, purely because "time
remaining to lose" shrinks as the sprint progresses. A team that only
holds standups during the first half of a sprint, on the mistaken
assumption that "we're basically done, no need to keep checking in,"
would still be leaving real value on the table - just less of it than
skipping standups entirely from day one.