uri
  • uri
Stats help: Q.In a family there are 5 earning members.The average of yearly earnings per earning person is Rs.40,000.The average earnings of 4 of the members is Rs.35,000.What is the yearly earning of the fifth member?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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uri
  • uri
My teacher has been using this formula:|dw:1378137456576:dw| not sure if we use this here.
terenzreignz
  • terenzreignz
no need. just some algebra. let's have a name for these 5, say, a, b, c, d, and e.
terenzreignz
  • terenzreignz
I don't know if it is possible, but it certainly complicates things...

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uri
  • uri
Well i want to learn using this formula..
anonymous
  • anonymous
\[\bar{x} =\frac{ \sum_{i=1}^{n}x_i }{ n }\] right?
uri
  • uri
No :o
anonymous
  • anonymous
\[=\frac{ x_1 +x_2 + x_3 +x_4 + x_5 }{ 5 }\] in your case
anonymous
  • anonymous
\[\Rightarrow $40,000 = \frac {4\cdot $35,000 + x_5}{5}\] so solve for \[x_5\]
uri
  • uri
\[200,000=140,000+x5\] \[x5=60000\]
anonymous
  • anonymous
there you go
uri
  • uri
That's all? aw thanks :)

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