Question

If the mean of five observations
4, X + 4, X + 8, x + 12 and x + 16 is 15,
then the value of x is
​

Answer 1

Answer:

x=7.75

Step-by-step explanation:

The mean of n observations is the sum of n observations, divided by the number of observations.

To find x, this concept has to be used.

Mean = $\frac{Sum}{Number}$

15 = $\frac{4+x+4+x+8+x+12+x+16}{5}$

Let us simplify the numerator.

15 = (44+4x)/5

Now, after cross multiplication, we have:

75 = 44+4x

31 = 4x

Dividing both sides by 4, we get:

x = 7.75