(1) In your biology class , your final grade is based on several things : a lab score , scores on two major tests , and your score on the final exam . There are 100 points available for each score . However , the lab score is worth 17 % of your total grade , each major test is worth 23.5 % , and the final exam is worth 36 % . Compute the weighted average for the following scores : 86 on the lab , 89 on the first major test , 73 on the second major test , and 98 on the final exam .

(2) Find the weighted average of a data set where 10 has a weight of 5 , 20 has a weight of 3 , and 50 has a weight of 2.

3) Find the weighted average of a data set where 70 has a weight of 2 , 80 has a weight of 3 , and 90 has a weight of 5 .

#) How hot does it get in Death Valley ? The following data are taken from a study conducted by the National Park System , of which Death Valley is a unit . The ground temperatures (F) were taken from May to November in the vicinity of Furnace Creek . Compute the mean , median , and mode for these ground temperatures . (Round your mean to four decimal places) 145 153 167 176 186 182 183 186 182 167 182 164 153 143