the mean of 7,9,x+3,12,2x-1 and 3 is 9 find the value of x
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Answer:
x = 7
Step-by-step explanation:
Mean = sum of all observations/ total number of observations
=> 7 + 9 + x + 3 + 12 + 2x - 1 + 3/6 = 9
=> 3x + 33= 9 × 6
=> 3x = 54 - 33
=> 3x = 21
=> x = 7
Hence x is 7
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