Acar painting company has determined that the painting time of cars is uniformly distributed between 25 and 105 minutes. what is the probability that it will take between 40 and 65 minutes for that company to paint a car

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)