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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 choices​M = 7​M = 6​M = 8​M = 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 choices​M = 7​M = 6​M = 8​M = 5

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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:

M=ΣXn M = \frac{\Sigma X}{n}

donde ΣX\Sigma X es la suma de todos los puntajes y nn es el número de puntajes. Reorganizando la fórmula para encontrar ΣX\Sigma X:

ΣX=M×n \Sigma X = M \times n

Sustituyendo los valores dados:

ΣX=5×6=30 \Sigma X = 5 \times 6 = 30

Ahora, agregamos el nuevo puntaje de X = 12 a la suma total:

ΣXnuevo=30+12=42 \Sigma X_{\text{nuevo}} = 30 + 12 = 42

El nuevo número de puntajes es nnuevo=6+1=7n_{\text{nuevo}} = 6 + 1 = 7.

Finalmente, calculamos la nueva media (M_{\text{nuevo}}):

Mnuevo=ΣXnuevonnuevo=427=6 M_{\text{nuevo}} = \frac{\Sigma X_{\text{nuevo}}}{n_{\text{nuevo}}} = \frac{42}{7} = 6

Por lo tanto, la media para el nuevo conjunto de puntajes es:

M=6 M = 6

This problem has been solved

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