anonymous
  • anonymous
Birth weights are normally distributed with a mean of 3419 g and a standard deviation of 494 g. If a hospital plans to set up special attention to the lightest 2% of babies, what weight is used for the cut-off separating the lightest 2% from the others?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
you need a zscore for .0200 i believe
amistre64
  • amistre64
you have a zscore table?
anonymous
  • anonymous
yes

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amistre64
  • amistre64
does it measure the area from the mean or from teh left tail?
anonymous
  • anonymous
from the left tail
amistre64
  • amistre64
ok, then we need to find the place in middle that is closest to .0200 in area
anonymous
  • anonymous
is it 0.0201?
amistre64
  • amistre64
sounds good, but id have to know the exact table your looking at :) follow the row to the left and record that number; follow the column up and add that number to the other one to determine the zscore itself
amistre64
  • amistre64
-2.05 is what i think it should be
anonymous
  • anonymous
I'm looking at positive zscores, area from the left...
anonymous
  • anonymous
0.201 is .5832. I don't know what to do from there on
amistre64
  • amistre64
your number dont make any sense
anonymous
  • anonymous
smfh
amistre64
  • amistre64
|dw:1332705274492:dw|
amistre64
  • amistre64
the number inthe field needs to be either closest to .0200 or .9800 depending on whats in your field to choose from
amistre64
  • amistre64
L should be 2.0 R should be .05 L+R = 2.05
anonymous
  • anonymous
I'm looking at the wrong thing
amistre64
  • amistre64
|dw:1332705450633:dw|
anonymous
  • anonymous
-2.0 and +2.0
amistre64
  • amistre64
the zscore for our next calculation should be -2.05 if we use the table correctly :) now: we should know that\[z=\frac{x-m}{sd}\to \ z(sd)+m=x \]
amistre64
  • amistre64
so inputing our information to find x we get: -2.05(494)+3419 = cutoff point
anonymous
  • anonymous
2406
anonymous
  • anonymous
thank you!
amistre64
  • amistre64
yw

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