Question

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

Answer 1

Step-by-step explanation:

7,9,x+3,12,2x-1and 3

mean = 9

mean=

$\frac{sum \: of \: all \: terms}{no \: of \: terms} \\ 9 = \frac{7 + 9 + x+3 + 12 + 2x-1 + 3 }{6} \\ 9 \times 6= 3x + 33 \\ 3x = 54 - 33 \\ x = \frac{21}{3} \\ = x = 7$