hello could you give me a hand with exercise in haskell

Hello, I am stuck in the following exercise of a haskell beginner course: Having the following functions:

maximoEntreTres uno dos tres = max uno (max dos tres)
minimoEntreTres uno dos tres = min uno (min dos tres)
dispersion uno dos tres =  maximoEntreTres uno dos tres - minimoEntreTres uno dos tres

The exercise asks me to create the following functions, which I did:

    diasParejos uno dos tres = dispersion uno dos tres < 30
    diasLocos uno dos tres =  dispersion uno dos tres > 100

my problem is in the function diasNormales , that the result of the "dispersion" of its parameters is not days or days or days (so it is within a rando of 31 and 99) I have tried it in several ways but I still do not get it: I tried the following way:

diasNormales = dispersion uno dos tres > 30 && dispersion uno dos tres < 100

// But of course, this solution is not adequate because it requires the use of the functions diasParejos and diasLocos I will appreciate the help very much

Greetings