Question

the arithmetic mean of 5,8,10,9,x,11,12 is 9. find x​

Answer 1

Answer:

5+8+10+9+x+11+12/7 = 9

55+x/7 = 9

55+x = 9 x 7

55+x = 63

x = 63 - 55

x = 8

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Step-by-step explanation:

Answer 2

Answer:

x = 8

Step-by-step explanation:

5 + 8 + 10 + 9 + 11 + 12 + x divided by 7 = 9

55 + x divided by 7 = 9

55 + x = 63 (multiplied by 7 to cancel out)

x = 8 (subtracted by 55 to cancel out)