Table 1 Age range (years) Number of family members *Includes infants. Table 2 Age range (years) Number of family members *Includes infants.

Native American cultures are studied by archaeologists throughout various parts of the United States. A particular prehistoric Native American extended family was found to have 78 members. The data below was found to be the distribution of the ages of the members of the extended family. Estimate the sample variance for the data. For the class of 31 and over, use 35.5 as the midpoint. The data is in Table 2 of the attached Graphs and Tables Word File.