can someone explain this to me please
X = the height of chairs (cm)
X has a mean of 60 and a standard deviation of 2. A random sample of 400 chairs made is taken.
Find then mean and SD of X(bar)
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nushii
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- 02-02-2010 20:14
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- 02-02-2010 20:51
not sure if you have enough info?
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nushii
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- 02-02-2010 20:53
(Original post by mad_ad666)
not sure if you have enough info? -
Straightpath
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- 02-02-2010 20:56
Are you sure that's all the info given. If yh then surely the mean is 60 and the SD is 2 :s
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- 02-02-2010 21:00
i think you have not enough info. if it gave you a probability you could then look back on your percentage tables to find a z value and then use simultaneous eqs to find x-bar and s.d.
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- 02-02-2010 21:01
(Original post by nushii)
can someone explain this to me please
X = the height of chairs (cm)
X has a mean of 60 and a standard deviation of 2. A random sample of 400 chairs made is taken.
Find then mean and SD of X(bar)
write it out like this.. and you should have more information than the random sample. -
nushii
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- 02-02-2010 21:05
(Original post by mad_ad666)
i think you have not enough info. if it gave you a probability you could then look back on your percentage tables to find a z value and then use simultaneous eqs to find x-bar and s.d.thank yu
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