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MathGroup Archive 2004

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Re: Maen

  • To: mathgroup at smc.vnet.net
  • Subject: [mg48154] Re: [mg48119] Maen
  • From: Tomas Garza <tgarza01 at prodigy.net.mx>
  • Date: Fri, 14 May 2004 20:59:12 -0400 (EDT)
  • References: <200405140413.AAA04802@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Please Load the package Statistics` before calling Mean.

In[3]:=
Mean[boys]//N

Out[3]=
180.705

Tomas Garza
Mexico City
----- Original Message ----- 
From: <per.ronne at doesnt.work.spam.filter.invalid>
To: mathgroup at smc.vnet.net
Subject: [mg48154] [mg48119] Maen


> I've just purchased Mathematica 5 but I've got some problems.
>
> I write:
>
> boys =
>   {192, 176, 178, 180, 189, 173, 177, 176, 176, 194,
>     178, 172, 175, 180, 170, 174, 180, 184, 177, 181,
>     190, 186, 187, 184, 190, 180, 178, 182, 181, 180,
>     175, 182, 182, 181, 179, 190, 173, 189, 173, 183,
>     172, 178, 182, 172, 190, 180, 176, 177, 181, 185,
>     174, 178, 178, 178, 170, 175, 178, 186, 185, 182,
>     179, 187, 183, 188, 191, 180, 193, 183, 185, 174,
>     174, 180, 191, 180, 177, 185, 192, 187, 170, 176,
>     170, 184, 179, 173, 184, 184, 190, 179}
>
> But when I try to get their average height [it is the height of boys in
> Danish upper grammar schools, grade 13 at the age of around 19], I get:
>
> Mean[boys]
> Mean[{192, 176, 178, 180, 189, 173, 177, 176, 176, 194, 178, 172, 175,
> 180,
>     170, 174, 180, 184, 177, 181, 190, 186, 187, 184, 190, 180, 178,
> 182, 181,
>      180, 175, 182, 182, 181, 179, 190, 173, 189, 173, 183, 172, 178,
> 182,
>     172, 190, 180, 176, 177, 181, 185, 174, 178, 178, 178, 170, 175,
> 178, 186,
>      185, 182, 179, 187, 183, 188, 191, 180, 193, 183, 185, 174, 174,
> 180,
>     191, 180, 177, 185, 192, 187, 170, 176, 170, 184, 179, 173, 184,
> 184, 190,
>      179}]
>
> And it doesn't help to put on a //N:
>
> Mean[boys] // N
> Mean[{192., 176., 178., 180., 189., 173., 177., 176., 176., 194., 178.,
> 172.,
>     175., 180., 170., 174., 180., 184., 177., 181., 190., 186., 187.,
> 184.,
>     190., 180., 178., 182., 181., 180., 175., 182., 182., 181., 179.,
> 190.,
>     173., 189., 173., 183., 172., 178., 182., 172., 190., 180., 176.,
> 177.,
>     181., 185., 174., 178., 178., 178., 170., 175., 178., 186., 185.,
> 182.,
>     179., 187., 183., 188., 191., 180., 193., 183., 185., 174., 174.,
> 180.,
>     191., 180., 177., 185., 192., 187., 170., 176., 170., 184., 179.,
> 173.,
>     184., 184., 190., 179.}]
>
> If I look up in the Stephen Wolfram's Mathematica book 5th Edition on
> page 109, it should be possible to get:
>
> data = {4.7, 7.2, 8.4, 5.8, 9.2, 3.9}
> Mean[data]
> 6.46667
>
> But instead I get:
>
> Mean[{4.7, 7.2, 8.4, 5.8, 9.2, 3.9}]
>
> What is wrong?
> -- 
> Per Erik Rønne
>
>



  • References:
    • Maen
      • From: per.ronne@doesnt.work.spam.filter.invalid
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