A sample of n = 4 scores has a mean of M = 8. If one new score with a value of X = 3 is added to the sample, what will be the value for the new mean?
Question
A sample of n = 4 scores has a mean of M = 8. If one new score with a value of X = 3 is added to the sample, what will be the value for the new mean?
Solution
Primero, calculemos la suma total de los puntajes originales. Sabemos que la media (M) es 8 y el número de puntajes (n) es 4. La fórmula para la media es:
Reorganizando para encontrar la suma total ():
Ahora, añadimos el nuevo puntaje (X = 3) a la suma total:
El nuevo número de puntajes es:
Finalmente, calculamos la nueva media (M_{\text{nuevo}}):
Por lo tanto, el valor de la nueva media es 7.
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