Math, asked by hani8640, 9 months ago

For what value of x, the mean of the given observation 2x-5, x+3, 7-X, 5-x and x+9 wi
frequencies 2,3,4,6 and I respectively is 4.​

Answers

Answered by Alcaa
9

Answer:

Value of x = 1.

Step-by-step explanation:

We are given the following data below;

        X                  frequency (f)               X*f

    2*x - 5                     2                         4*x - 10

      x + 3                       3                         3*x + 9

      7 - x                        4                         28 - 4*x

      5 - x                        6                         30 - 6*x

      x + 9                        1                           x + 9

Here, ∑f = 2 + 3 + 4 + 6 + 1 = 16

∑X*f = 4*x - 10 + 3*x + 9 + 28 - 4*x + 30 - 6*x + x + 9 = 66 - 2*x

Now, Mean of data, X bar = \frac{\sum Xf}{\sum f}

                                 4  =  \frac{66-2x}{16}

                              64 = 66 - 2*x

                              2*x = 66 - 64

                               x = 2/2 = 1

Therefore, value of x is 1.

Answered by sakshisachdeva124
0

ANSWER:

x=1

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