![StupidFatChipmunk](/avatars/23056.jpg)
StupidFatChipmunk
06.09.2020 •
Mathematics
At a sleep over, six friends were talking about the number of hours of sleep they usually get each night. Five of them said: 12,9,4,8, & 7 hours. The sixth friend said, “ the average of our sleep hours is 9, so how many hours do I sleep ?
Solved
Show answers
More tips
- S Society and Politics Why Did Medvedev Announce a New Privatization of State Property?...
- F Family and Home Stay Warm but Don t Overheat: What is the Optimal Temperature for Your Home During Winter?...
- H Health and Medicine How to Treat the Flu: A Comprehensive Guide...
- O Other What is a Disk Emulsifier and How Does it Work?...
- F Family and Home What does a newborn need?...
- F Family and Home Choosing the Right Car Seat for Your Child: Tips and Recommendations...
- F Food and Cooking How to Get Reconfirmation of Registration?...
- C Computers and Internet How to Get Rid of Spam in ICQ?...
- A Art and Culture Who Said The Less We Love a Woman, the More She Likes Us ?...
- F Family and Home How to Get Rid of Your Neighbors?...
Answers on questions: Mathematics
- M Mathematics Convert 0.725 to a percent...
- M Mathematics 3/7 to fill a large glass. how many glasses can be filled using 50 cartons of milk...
- E English Some archaic language—such as “thy,” “thou,” and “’tis”—can be deciphered through the of a context clues b pronoun references c vocabulary d denotation...
- H History The author suggests that all the decisions the crew made about the Apollo 11 patch were deliberate. How does the author s use of chronological order help to convey this...
- M Mathematics A quarterback throws a football from a position that is 10 yards from the goal line and 50 yards from the sideline. His receiver catcatches it at a position that is...
Ответ:
So average of a set of values is the sum of given values divided by the number of values
So, in this case the given values are 12, 9 , 4 , 8 ,7 and x (letting the 6th friend's time be x)
so the average will be:
(12 + 9 + 4 + 8 + 7 + x)/6 = 9
40 + x = 54
x = 54 - 40
x = 14 hours
Ответ: