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12. (a) If the arithmetic mean of 7, x – 2, 10, x + 3 is 9, find x. |
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Answer» ONG>Answer: 9 Step-by-step EXPLANATION: The numbers are 7, x-2, 10, x+3 Arithmetic mean = Total sum/Total no. THUS 9 = [7+(x-2)+10+(x+3)] / 4 36= 17+2x+1 36= 18+2x 36-18 =2x 18=2x x=18/2 therefore x=9. |
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