Solution
= Solution
For attendance probability $9/10$, absence on both independent observations has <conditional probability>
$$
\boxed{P(\text{absent}\mid\text{diligent})=(1-9/10)^2=1/100.}
$$
= Solution
For attendance probability $9/10$, absence on both independent observations has <conditional probability>
$$
\boxed{P(\text{absent}\mid\text{diligent})=(1-9/10)^2=1/100.}
$$