20 pts!
at jefferson middle school, eighty-two students were asked which sports they plan to participate in for the coming year. twenty students plan to participate in track and cross country; six students in cross country and basketball; and eight students in track and basketball. twelve students plan to participate in all three sports. a total of thirty students plan to participate in basketball, and a total of forty students plan to participate in cross country. ten students don't plan to participate in any of the three sports.

how many students plan to just participate in cross country?

2
4
40
30

Name and describe the three most important measures of central tendency. choose the correct answer below. a. the mean, sample size, and mode are the most important measures of central tendency. the mean of a data set is the sum of the observations divided by the middle value in its ordered list. the sample size of a data set is the number of observations. the mode of a data set is its highest value in its ordered list. b. the sample size, median, and mode are the most important measures of central tendency. the sample size of a data set is the difference between the highest value and lowest value in its ordered list. the median of a data set is its most frequently occurring value. the mode of a data set is sum of the observations divided by the number of observations. c. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is the product of the observations divided by the number of observations. the median of a data set is the lowest value in its ordered list. the mode of a data set is its least frequently occurring value. d. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is its arithmetic average. the median of a data set is the middle value in its ordered list. the mode of a data set is its most frequently occurring value.