Chapter 18 - Inference in Practice - Apply Your Knowledge - Page 430: 18.14b

See below.

Using part a) we have $1-0.29=0.71$ chance of deciding that the average reading scores are below a basic level, in the case of the true average reading score being equal to $255$. This is a high probability, thus the test cannot protect us from deciding that the average reading score in our district is not above a basic level.