The mean of a + 1,a + 3,a + 4 and a + 8 isA) a + 7B) a + 4 C) a – 3

1.	The mean of a + 1,a + 3,a + 4 and a + 8 isA) a + 7B) a + 4 C) a – 3 D) None
Answer» Correct option is: B) a + 4 Mean = \(\frac {sum \, of\, obs.}{Number \, of\, obs.}\) = \(\frac {(a+1)+ (a+3) + (a+4) + (a+8)}{4} \) \(= \frac {4a+16}4 = \frac {4(a+4)}{4} = a + 4\) Correct option is: C) a + 4

The mean of a + 1,a + 3,a + 4 and a + 8 isA) a + 7B) a + 4 C) a – 3 D) None

Answer»

Correct option is: B) a + 4

Mean = \(\frac {sum \, of\, obs.}{Number \, of\, obs.}\) = \(\frac {(a+1)+ (a+3) + (a+4) + (a+8)}{4} \)

\(= \frac {4a+16}4 = \frac {4(a+4)}{4} = a + 4\)

Correct option is: C) a + 4

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The mean of a + 1,a + 3,a + 4 and a + 8 isA) a + 7B) a + 4 C) a – 3 D) None

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