geerky42
  • geerky42
Using the following array, determine the value of the mean of the 19th row.
Mathematics
schrodinger
  • schrodinger
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geerky42
  • geerky42
|dw:1364052369205:dw|
ParthKohli
  • ParthKohli
Just pattern recognition... The mean of the 1st line is \(2\). The mean of the 2nd line is \(5\). The mean of the 3rd line is \(10\). The mean of the 4th line is \(17\). You're just adding 3, then adding 5, then adding 7, then adding 9... and so on
geerky42
  • geerky42
Smart approach. Thanks!

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ParthKohli
  • ParthKohli
You can figure out the mean of the 5th line by adding 9, then the mean of the 6th line by adding 11... You're welcome!
ParthKohli
  • ParthKohli
But that's long work, so I have another pattern recognition thingy.
ParthKohli
  • ParthKohli
Never mind, just use that one.
geerky42
  • geerky42
That's fine, I can handle it. I got 362. Am I correct?
geerky42
  • geerky42
I didn't add 39.
ParthKohli
  • ParthKohli
No, you're right lol
geerky42
  • geerky42
Oh ok. Just making sure. Thanks!
RadEn
  • RadEn
|dw:1364053086567:dw|
ParthKohli
  • ParthKohli
Oh yeah, sum of an arithmetic sequence :-)
RadEn
  • RadEn
yup :)

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