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 98 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 40 23 25 10

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.

if you are looking for the unit rate then the answer would be 9 because unit rate is distance divided by time.

step-by-step explanation:

2x + 8

step-by-step explanation:

we can set up an equation to find the girls' ages. the equation is         28=0.5x-5+x. (comment if you need me to explain how i got this equation.) so, you add x and 0.5x to get 1.5x and add 5 to each side. your new equation is 33=1.5x. now divide both sides of the equation by 1.5 to get 22=x. because x is mary's age, to find jasmine's age we subtract mary's age from 28. we find that mary is 22 years old and jasmine is 6 years old.