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 83 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 21 19 10

Consider the following data: 5,−5,5,−5,−5,14,55,−5,5,−5,−5,14,5 Copy Data Step 1 of 3 :   Calculate the value of the sample variance. Round your answer to one decimal place.

The ages of residents of a small town are given in the following frequency distribution. Approximate the mean age. Round your answer to one decimal place. Class                 Frequency 0 - 9 281 10 - 19 204 20 - 29 219 30 - 39 258 40 - 49 176 50 - 59 93 60 - 69 23 70 - 79 23 80 - 89 10 90 - 99 3   What is the average mean?

It has been reported that 84% of federal government employees use e- mail. If a sample of 235 federal government employees is selected, find the mean, variance, and standard deviation of the number who use e-mail. Round your answers to three decimal places. a. Find mean

Next question The ages (in years) of a random sample of shoppers at a gaming store are shown. Determine the range, mean, variance, and sta the sample data set. 12, 16, 23, 14, 17, 18, 21, 18, 15, 15 9 ...... The range is: (Simplify your answer.)

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​Recently, a random sample of 13–18 year olds was​ asked, "How much do you currently have in​ savings?" The data in the table represent the responses to the survey. Approximate the mean and standard deviation amount of savings.   LOADING... Click the icon to view the frequency distribution for the amount of savings. Savings Frequency   ​$0– ​$199 343 ​$200– ​$399 94 ​$400– ​$599 62 ​$600– ​$799 21 ​$800– ​$999 9 ​$1000– ​$1199 5 ​$1200– ​$1399 3 The sample mean amount of savings is ​$nothing. ​(Round to the nearest dollar as​ needed.) The sample standard deviation is ​$nothing. ​(Round to the nearest dollar as​ needed.)