Students at University X must be in one of the class ranks—freshman, sophomore, junior, or senior. At University X, 35% of the students are freshmen and 30% are sophomores. If a student is selected at random, the probability that her or she is either a junior or a senior is

Percentage of probability of junior or senior student is 35%.

Step-by-step explanation:

Given:

Freshmen = 35%

Sophomores = 30%

We need to find the the probability of student either a junior or a senior.

Solution:

From the above statement there are four classes, where freshmen is 35% and

sophomores is 30%,

So the probability of freshmen and sophomores as.

The probability of junior or senior student is one minus the probability that event does not occur.

Therefore, the probability of student either a junior or a senior is 0.35 or percentage of probability is 35%.

step-by-step explanation:

i'm pretty sure it would take 20 hours because it's half the men so you multiply the number of hours it takes by 2