Question

9) If the mean of 5 , 7 , 9 , is 9 ,then the value of is (a) 11 (b) 15 (c) 18 (d) 16.​

Answer 1

Answer:

b)15 is the correct answer

Answer 2

Answer:

15

Step-by-step explanation:

5+7+9+a/4 = 9

21+a/4 = 9

21+a = 36

a = 15

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