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# Arithmetic mean

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Intern
Joined: 12 Feb 2009
Posts: 8
Schools: LBS, UPenn, IMD

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18 May 2009, 04:06
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What can you advice on that question ?

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Director
Joined: 27 Jun 2008
Posts: 506
WE 1: Investment Banking - 6yrs

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18 May 2009, 04:59
1
Units = u
# of days = n

Mean :
u/n = 50 or u = 50n

Second statement :
(u+90)/(n+1) = 55
Solving this,
u+90=55n+55
50n+90 = 55n+55
35=5n
n = 7

E
Manager
Joined: 10 May 2009
Posts: 59

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18 May 2009, 07:20
Change in Mean = (New Value-Old Mean)/New number of terms

Therefore 5=(90-50)/n+1
n=7

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This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Re: Arithmetic mean &nbs [#permalink] 18 May 2009, 07:20
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