Question

Find the value of x . 12.5,-10,-7.5,x ; The mean is 11.5

Answer 1

Answer:

51

Step-by-step explanation:

The mean is obtained by adding up the values in the data set and then divide by the number of values that you added:

$\bar X=\sum{X_i}$

Given our mean as 11.5 and n=4:

$\bar X=\frac{1}{n}\sum{X_i}\\\\\\\\\therefore\sum{X_i}\\=11.5\times 4=46$

#Knowing our sum as 65, we can obtain x by subtracting sum of known values from 65:

$x=46-(12.5+-10+-7.5)\\=51$

Hence, the value of x is 51