The type of people who are in lesser numbers belong to "Minority".
(a) 20 teachers out of 30 in a school are male. Thus, female teachers are in minority.
(b)Only 5% population of a city consists of the Buddhists. So, the Buddhists are in minority.
(c)80% employees are vegetarian in the factory. So, the Non-Vegetarians are in minority.
(d)In class of 50 students, 40 belong to more well-of (i.e. rich) families. So, the students belonging to poor or middle class families are in minority.