If there are 13 values in a data set in order from smallest to largest what is the first quartile of the data set

a. the mean of the 4th and 5th values
b. the mean of the 3rd and 4th values
c. the mean of the 2nd and 3rd values
d. the mean of the 5th and 6th values

What is the number 321,000,000 in scientific notation? also what is the number? ?

Apoll is being conducted at a mall nothingto obtain a sample of the population of an entire country. what is the frame for this type of​ sampling? who would be excluded from the survey and how might this affect the results of the​ survey? what is the frame for this type of​ sampling? a. the frame is people who need new clothes. b. the frame is people who shop at the mall. c. the frame is people who like to shop. d. the frame is the entire population of the country. who would be excluded from the survey and how might this affect the results of the​ survey? a. any person that does not need new clothes is excluded. this could result in sampling bias due to undercoverage. b. any person who does not shop at the mall is excluded. this could result in sampling bias due to undercoverage. c. any person who does not shop at the mall is excluded. this could result in nonresponse bias due to people not participating in the poll. d. there is nobody that is being excluded from the survey.

If wxyz is a square, which statements must be true? plz < 3