Researchers are interested in whether the heart rate of long-distance runners differs from that of other athletes. They randomly select 8 long-distance runners and measure their resting heart rate and obtain: 45, 42, 64, 54, 58, 49, 48, 56. The average resting heart rate of athletes in the general population is 60 beats per minute. Is there sufficient evidence to support that long-distance runners have a different resting heart rate than other athletes?

Is a positive integer raised to a negative power always positive

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?