Question

The mean of 7, 9, x + 3, 12, 2x - 1 and 3 is 9. Find the value of x​

Answer 1

Answer:

Step-by-step explanation:

Given data is 7, 9, x+3, 12, 2x -1 and 3 and

mean is 9.

Number of observations = 6

∴Mean = Sum of observations / Number of observations

⇒ 9 = ( 7 + 9 +x +3 + 12 + 2x - 1 + 3 ) / 6

⇒9 × 6 = 3x + 33

⇒54 = 3x + 33

⇒ 54 - 33 = 3x

⇒21 = 3x

⇒21 / 3 = x

⇒ x = 7 is the answer.

Answer 2

Answer:

x=7

Step-by-step explanation:

Mean=Sum of observations/Number of observations

Sum of observations=7+9+x+3+12+2x-1+3

=33+3x

Number of observations=6

Mean=33+3x/6=9

=33+3x=6*9

=33+3x=54

=3x=54-33

=3x=21

=x=21/3

=x=7

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