Can someone help me with the ones I got wrong

WA CH-2 and CH-3 - MTH-265, secti x webassign.net/web/Student/Assignment-Responses/submit?dep=24726134&tags=autosave#question4028838_7 A : Apps M Gmail YouTube Maps m Our Western World:. 8. [1/3 Points] DETAILS PREVIOUS ANSWERS BBBASICSTAT8 3.2.022. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER 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 87 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 Number of individuals 31 and over 35 21 19 12 X = 16.4 $2 = 1.5 5 = 1.2 X X Need Help? Read It 9. [2/2 Points] DETAILS PREVIOUS ANSWERS BBBASICSTAT8 3.3.007.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER At one hospital there is some concern about the high turnover of nurses. A survey was done to determine how long (in months) nurses had been in their current positions. The responses (in months) of 20 nurses were as follows. 29 8 11 20 31 42 33 48 18 14 17 20 25 72 Type here to search O 9 2:56 PM 9/1/2020