A sample of n = 6 scores has a mean of M = 5. One person with a score of X = 12 is added to the distribution. What is the mean for the new set of scores?Group of answer choicesM = 7M = 6M = 8M = 5
Question
A sample of n = 6 scores has a mean of M = 5. One person with a score of X = 12 is added to the distribution. What is the mean for the new set of scores?Group of answer choicesM = 7M = 6M = 8M = 5
Solution
Primero, calculemos la suma total de los puntajes originales. Sabemos que la media (M) de los 6 puntajes es 5. La fórmula para la media es:
donde es la suma de todos los puntajes y es el número de puntajes. Reorganizando la fórmula para encontrar :
Sustituyendo los valores dados:
Ahora, agregamos el nuevo puntaje de X = 12 a la suma total:
El nuevo número de puntajes es .
Finalmente, calculamos la nueva media (M_{\text{nuevo}}):
Por lo tanto, la media para el nuevo conjunto de puntajes es:
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