If the average grade on an exam was 75% and the standard deviation was 4%, what would the three uper limit intervals be for the given normal curve by the empirical rule? O 72, 77, and 90 O 79, 83, and 87 O 83, 87, and 91 O 75, 79, and 83

For questions 6 through 11, refer to the following table, representing responses from the 2018 GSS: Respondent Sex Mean Hours Worked Last Week Standard Deviation N Male 44.60 14.969 670 Female 38.15 13.276 711 6. What proportion of females worked less than 40 hours per week?    a. How many people in the sample does that correspond to?7. What percentage of males worked between 40 and 50 hours per week?    a. How many people in the sample does that correspond to?8. What number of hours worked among females corresponds with a Z score of -2.00?9. Calculate the number of hours worked last week that corresponds to the 95th percentile for each sex.    a. If you were going to calculate the 75th percentile, what Z value would you use? 10. Calculate the standard error for both males and females.    a. What are you using for sigma, and why? 11. Calculate the 95% confidence interval for each sex. Can you say with 95% confidence that they are different? Why or why not?    a. If you were…

What is the population standard deviation using the following formula

70 74 79 82 77 80 84 For this sample of golf scores give: 1. Σε. 2. Σ 3. x 4. s= 5. The sample standard deviation =