This is the 257th most frequent Italian word.
scritto
Written.
Here, 'scritto' is the past participle of the verb 'scrivere', used in the present perfect tense to express an action completed in the past.
Ho scritto una lettera a un mio amico.
I wrote a letter to a friend of mine.
Here, 'scritto' functions as an adjective to describe the noun 'compito', specifying its nature as being in written form.
Il compito scritto è stato molto chiaro.
The written assignment was very clear.
In this instance, 'scritto' is used in the passive voice together with 'è stato' to indicate the author of the book.