Question

If the mean of the observation 1, 2, 8, x + 1, 3, 2x + 1, 4 is 5 then value of x is (A)3 (B) 4 (C) 5 (D)6​

Answer 1

Answer:

37

Step-by-step explanation:

⇒  ∑xi=x+2x+1+2x+5+2x+9=7x+15

⇒  n=4

⇒  x=30

x=n∑xi

30=47x+15

120=7x+15

∴  x=15

⇒  After substituting value of x last two numbers become 35 and 39

∴  Mean of last two numbers =235+39=274=37

Answer 2

Ans is 37

because when we do 235+39=274=37

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