Question

The mean of the observations: x. x + 3, 2x +1.5.x - 4 and 3x + 7 is 11. Find the value of x.​

Answer 1

Answer:

given mean = 11

we have x + x+3 +2x + 1.5 x - 4 /5

7x - 1 /5 = 11

7x - 1 = 55

7x = 56

x = 8

Answer 2

Answer:

4

Step-by-step explanation:

Here, number of terms = 5 (x, x + 3, 2x + 1, 5x - 4 and 3x + 7)

Sum of terms = x + x + 3 + 2x + 1 + 5x - 4 + 3x + 7 = 12x + 7

Mean = 11

We know that, mean = $\sf\frac{sum\ of\ observations}{number\ of\ observations}$

So, mean = $\sf\frac{12x + 7}{5} = 11$

Cross multiplying, we get

12x + 7 = 55

12x = 48

x = 48/12

x = 4