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Pentru analiza calitatii s-a stabilit urmatoarea distributie relativa a unui lot...

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Pentru analiza calitatii s-a stabilit urmatoarea distributie relativa a unui lot de piese, pe grupe ale greutatii lor, exprimata in grame. Care care este greutatea medie (rotunjit la numar intreg) a unei piese din acel lot?

Grupe de piese dupa greutate (g)Frecventa relativa a pieselor
xifi*
    sub 25010.0%
250 - 35012.5%
350 - 45052.3%
 peste 45025.2%
total100%

 

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