Math Help - hypotheses testing

1. hypotheses testing

Thanks, i dont know were to start, and i am having difficulty on hypotheses testing , thanks

2. I forgot to write this additional information:

Pete takes a random sample of 20 of his customers and records which topping they ask for.

Let X be the number of these who ask for anchovy topping.

Then X - bin(20,p) where n=20 and p= probability.