STA 2023 QUIZ 2

STA 2023 QUIZ 2. Scores on an exam follow an approximately bell shaped distribution with a mean of 76.4 and a standard deviation of 6.1 points. Approximately, what percentage of the data is between 58.1 points and 94.7 points? 99.7% Yes, 58.1 and 94.7 are three standard deviations away from the mean. So, according to the Empirical Rule, there should be 99.7% of the data within three standard deviations away from the mean. 68% 50% 95% This is an application of the Empirical Rule. The Empirical Rules states that about 68% of the data lies within one standard deviation of the mean, about 95% of the data lies within two standard deviations of the mean and about 99.7% of the data lies within three standard deviations of the mean. Question 2 0.5 / 0.5 pts Find the sample standard deviation of the following data set of amount of time spent exercising per day (hr) by a random sample of college students, using the statistical functions on your calculator. 0.679 0.345 0.332 0.719 0.677 0.720 0.5787 0.1707 This study source was downloaded by from CourseH on :21:54 GMT -06:00 STA 2023 QUIZ 2 0.1870 0.2017 Use your calculator to find the sample standard deviation. Question 3 0.5 / 0.5 pts Below is a stem and leaf plot of the magnitude of all earthquakes (above 2.0) on September 4th, 2012. This data was recorded by the USGS. Find the median.