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2 I ett stickprov med 12 kaffepaket var medel-
värdet av vikten 507 g . I ett annat stickprov
med 8 paket var medelvärdet 497 g .
Vad blir medelvärdet om stickproven slås
samman?

Ask by Best Harrington. in Sweden
Jan 24,2025

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Medelvärdet för det kombinerade stickprovet är 503 g.

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Beyond the Answer

För att beräkna det sammanlagda medelvärdet när de två stickproven slås samman, kan vi använda formeln för medelvärdet som väger varje stickprov efter antalet observationer.
Det första stickprovet har 12 paket med ett medelvärde av 507 g, vilket ger en totalvikt av 12 * 507 = 6084 g. Det andra stickprovet har 8 paket med ett medelvärde av 497 g, vilket ger en totalvikt av 8 * 497 = 3976 g.
När vi lägger ihop dessa vikter får vi 6084 g + 3976 g = 10060 g. Totalt antal paket är 12 + 8 = 20.
Därför blir det slutgiltiga medelvärdet: 10060 g / 20 = 503 g.

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