a fair number of

un buen número de | una gran cantidad de

Ex: This opinion bothers me on two counts, one because it smacks of exploitation and, two, because a fair number of the world's leaders, for better or worse, were remarkably successful as leaders in spite of less than outstanding academic records.

= un gran número de
Ex: This opinion bothers me on two counts, one because it smacks of exploitation and, two, because a fair number of the world's leaders, for better or worse, were remarkably successful as leaders in spite of less than outstanding academic records.