In past years, the average time that it takes for a woman to complete the san francisco marathon was 4.62 hours. this year the average time for the 3845 women who finished the sf marathon was 4.59 hours with a standard deviation of 1.11 hours. can it be concluded that this years average time for women to finish the sf marathon is statistically significantly less than the past years' average time?

(co 3) the soup produced by a company has a salt level that is normally distributed with a mean of 5.4 grams and a standard deviation of 0.3 grams. the company takes readings of every 10th bar off the production line. the reading points are 5.8, 5.9, 4.9, 6.5, 5.0, 4.9, 6.2, 5.1, 5.7, 6.1. is the process in control or out of control and why? it is out of control as two of these data points are more than 2 standard deviations from the mean it is in control as the data points more than 2 standard deviations from the mean are far apart it is out of control as one of these data points is more than 3 standard deviations from the mean it is in control as the values jump above and below the mean