A group of 6 students was asked, "How many hours did you watch television last week?" Here are their responses. 7,9,4,13,13,16
Find the mean number of hours for these students.
If necessary, round your answer to the nearest tenth.

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?