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
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 =
4 =
64 = 66 - 2*x
2*x = 66 - 64
x = 2/2 = 1
Therefore, value of x is 1.
ANSWER:
x=1
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