During a study on how long a VIU psychology student can last without blinking, it was found that the times were modeled by a uniform distribution from 8 to 23 seconds.

What percent of students will blink after 20 seconds but before 21 seconds? Round the answer to 2 decimal places.

During a study on how long a VIU psychology student can last without blinking, it was found that the times were modeled by a uniform distribution from 8 to 23 seconds.

What percent of students will take exactly 20 seconds to blink?

%

A study of the amount of time for students to finish test finds that all students take between 45 and 90 minutes, and all times in that range are equally likely.

Find P(X < k), assuming 45 \leq k \leq 90?

A study of the amount of time for students to finish test finds that all students take between 45 and 90 minutes, and all times in that range are equally likely.

What is the probability a student takes less than 50 minutes? Round the answer to 2 decimal places.