Grupperede observationer

I 6. klasse målte eleverne deres højder.
De fik disse resultater, som her er sat i rækkefølge:
143, 146, 148, 150, 152, 152,152, 154, 154, 156,
157, 158, 158, 162, 163, 163, 166, 166, 166, 166

De enkelte tal kaldes observationer.

Når der er så mange forskellige observationer, kan det være en god ide at samle dem i grupper.
Her er højderne samlet i grupper med 5 cm i hver. Grupper kaldes også intervaller, men samlet set kaldes det nu grupperede observationer:

gruppobsUdklip

Det er meget vigtigt, at intervallerne er lige lange.

Grupperede observationer vises i et histogram

Histo6klasseUdklip

 

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