Suppose the returns on long-term corporate bonds are normally distributed. The average annual return for long-term corporate bonds from 1926 to 2007 was 5.7 percent and the standard deviation of those bonds for that period was 8.5 percent. Picture

Required: (a) Based on this historical record, what is the approximate probability that your return on these bonds will be less than -3.7 percent in a given year? (Do not round intermediate calculations.)
(b) What range of returns would you expect to see 95 percent of the time? (Do not round intermediate calculations.)
(c) What range would you expect to see 99 percent of the time? (Do not round intermediate calculations.)

It appears that people who are mildly obese are less active than leaner people. one study looked at the average number of minutes per day that people spend standing or walking. among mildly obese people, the mean number of minutes of daily activity (standing or walking) is approximately normally distributed with mean 376 minutes and standard deviation 64 minutes. the mean number of minutes of daily activity for lean people is approximately normally distributed with mean 528 minutes and standard deviation 107 minutes. a researcher records the minutes of activity for an srs of 7 mildly obese people and an srs of 7 lean people. use z-scores rounded to two decimal places to answer the following: what is the probability (image for it appears that people who are mildly obese are less active than leaner people. one study looked at the averag0.0001) that the mean number of minutes of daily activity of the 6 mildly obese people exceeds 420 minutes? what is the probability (image for it appears that people who are mildly obese are less active than leaner people. one study looked at the averag0.0001) that the mean number of minutes of daily activity of the 6 lean people exceeds 420 minutes?