4. [-/2.65 Points] DETAILS BBUNDERSTAT12 3.1.026.MI. MY NOTES ASK YOUR TE In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 17%% of your total grade each major test is worth 21%, and the final exam is worth 41%. Compute the weighted average for the following scores: 96 on the lab, 68 on the first major test, 73 on the second major test, and 76 on the final exam. 5. [-/2.65 Points] DETAILS BBUNDERSTAT12 3.2.005.MI. MY NOTES ASK YOUR TEA Consider the data set. 2, 3, 4, 7, 8 (a) Find the range. (b) Use the defining formula to compute the sample standard deviation s. (Round your answer to two decimal places.) (c) Use the defining formula to compute the population standard deviation s. (Round your answer to two decimal places.) 6. [-/2.65 Points] DETAILS BBUNDERSTAT12 3.2.014.MI. MY NOTES ASK YOUR TEAC Consider sample data with x = 10 and s = 5. (a) Compute the coefficient of variation. (b) Compute a 75% Chebyshev interval around the sample mean. Lower Limit Upper Limit 7. [-/2.65 Points] DETAILS BBUNDERSTAT12 3.2.027. MY NOTES ASK YOUR TEACH What was the age distribution of prehistoric Native Americans? Extensive anthropological studies in the southwestern United States gave the following information about a prehistoric extended family group of 77 members on what is now a Native American reservation. For this community, estimate the mean age expressed in years, the sample variance, and the sample standard deviation. For the class 31 and over, use 35.5 as the class midpoint. (Round your answers to one decimal place Age range (years) 1-10 11-20 21-30 31 and over Number of individuals 33 19 15 10