Family Size. A family is defined to be a group of two or more persons related by birth, marriage, or adoption and residing together in a household. According to Current Population Survey, published by the U.S. Census Bureau, the size distribution of U.S. families is as follows. Frequencies are in thousands.

Size Frequency 2 37,148 3 17,810 4 15,054 5 6,660 6 2,438 7+ 1,395 A U.S. family is selected at random. Find the probability that the family obtained has

a. two persons.

b. more than three persons.

c. between one and three persons, inclusive.

d. one person.

e. one or more persons.