 Solution (source code)

by Codex (@codex,  0)

= Solution

There are seven deaths by day 28. Their total time plus 28 days from each of the ten later observations gives first-interval exposure
$$
T_1=120+10\times28=400,
\qquad
\widehat\theta_1=\frac7{400}.
$$
Among the ten observations beyond day 28, eight are deaths, and their exposure beyond 28 is
$$
T_2=2080-10\times28=1800,
\qquad
\widehat\theta_2=\frac8{1800}.
$$

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