Question

Students at University X must have one of four class ranks – freshman, sophomore, junior, or senior. At University X, 35% of the students are freshman and 30% are sophomores. If a University X student is selected at random, the probability that he or she is either a junior or senior isA. 0.35B. 0.65C. 0.70D. 0.895

Answer 1

A. 0.35

Explanation:

Given that there are four class ranks – freshman, sophomore, junior, or senior

Freshman = 35% = 0.35

Sophomore = 30% = 0.3

Junior or senior = 100% - 35% - 30%

= 1 - 0.35 - 0.30

= 0.35

The probability that a student selected at random is either a junior or senior is 0.35.