Find the reference means rejected by an upper-tail test

Clara, who has diabetes, monitors glucose levels that vary throughout the day. A sample of 75 readings at random times over a week gives $\sum x=511.5$, $\sum x^2=4027.89$.

(i) Find the set of $\mu_0$ values for which it would be accepted that $\mu>\mu_0$ at the 10% significance level.

(ii) State, with a reason, whether that conclusion would remain valid if all 75 readings were taken during weekends.