For each variable, determine whether it is best thought of as discrete or continuous.

VariableDiscreteContinuous(a)The number of tickets purchased by a caller on a Rose Bowl ticket hotline

(b)The number of students, in a class of35

,who improve their score from the first midterm to the second midterm

(c)The lifetime, in hours, of a100

-watt light bulb manufactured by Bingley Corporation

(d)The total number of goals scored by a soccer team in a season