Ask your own question, for FREE!
Mathematics 25 Online
OpenStudy (anonymous):

X1,...,X64 are identically distributed independent random variables such that E(Xi)=3.1 and Var(Xi)=9. What is the standard deviation of their average? In other words, what is the standard deviation of X= (X1+...+X64)/64 ?

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Latest Questions
ShikuniShigana: My favorite drawings I did.
2 hours ago 15 Replies 5 Medals
kamariana: My recent drawings.
4 hours ago 8 Replies 2 Medals
XxXGhostXxX: Why does our smart score go down if we offline for awhile?
6 hours ago 2 Replies 0 Medals
75: Why is there a delete button for messages on qc but it doesnt delete?
10 hours ago 5 Replies 0 Medals
EdwinJsHispanic: Does anyone make lyrics and music, if so, can I have any tips on how to write a f
11 hours ago 7 Replies 1 Medal
CutsieWoopsie: how am I doing?
4 hours ago 13 Replies 1 Medal
IzzyCookie: If someone could tell me what they think of this, that would be great :D Is it okay if I cry? Sometimes I canu2019t.
23 hours ago 10 Replies 3 Medals
Arriyanalol: What did teenagers want to do in the 1950s? Explain your reasoning.
1 day ago 9 Replies 1 Medal
Arriyanalol: Should Elvis be considered "The King" of Rock and Roll? Explain your reasoning.
1 day ago 10 Replies 1 Medal
ShikuniShigana: Ight gang what do u think of these guys. Shikuni: A demonic universal being who saved a rabbit life by controlling his corpse from getting eaten from a few
1 day ago 14 Replies 2 Medals
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!