The following histogram represents the distribution of accep…

The following histogram represents the distribution of acceptance rates (percent accepted) among 25 business schools in 2004. In each class interval, the left endpoint is included, but the right endpoint is not included, so the class intervals are [10, 15), [15, 20), etc. What percentage of universities had acceptance rates less than 25%?

The time it takes a student to walk from one end of the camp…

The time it takes a student to walk from one end of the campus to the other is normally distributed with a mean of 27.9 minutes and a standard deviation of 3.6 minutes. What is the probability that the time it takes a student to walk across campus is greater than 30?

In a large high school, a poll of students showed that 68% o…

In a large high school, a poll of students showed that 68% of students think that Mathematics is difficult, 37% think that Spanish is difficult, and 76% find at least one of these two subjects difficult. If a randomly selected student finds Spanish difficult, what is the probability that the student finds Mathematics difficult too?