While using ‘everybody’ ‘everyone’, ‘anybody’, and ‘each’ the pronoun of the masculine or the
feminine gender is used according to the context.
Example : I shall be happy to help each of the boys in this practice.

But when the sex is not mentioned, we use the pronoun of the masculine gender.
Example :
1. Anyone can qualify this exam if he tries.
2. Each of the six boys in the class has finished his task.