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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?

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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:

M=Xn M = \frac{\sum X}{n}

Reorganizando para encontrar la suma total (X\sum X):

X=M×n \sum X = M \times n X=8×4 \sum X = 8 \times 4 X=32 \sum X = 32

Ahora, añadimos el nuevo puntaje (X = 3) a la suma total:

Xnuevo=32+3 \sum X_{\text{nuevo}} = 32 + 3 Xnuevo=35 \sum X_{\text{nuevo}} = 35

El nuevo número de puntajes es:

nnuevo=4+1 n_{\text{nuevo}} = 4 + 1 nnuevo=5 n_{\text{nuevo}} = 5

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

Mnuevo=Xnuevonnuevo M_{\text{nuevo}} = \frac{\sum X_{\text{nuevo}}}{n_{\text{nuevo}}} Mnuevo=355 M_{\text{nuevo}} = \frac{35}{5} Mnuevo=7 M_{\text{nuevo}} = 7

Por lo tanto, el valor de la nueva media es 7.

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