Mean of a – 2d, a – d, a + d and a + 2d is A) -a B) 3a C) a D)

1.	Mean of a – 2d, a – d, a + d and a + 2d is A) -a B) 3a C) a D) 5a
Answer» Correct option is: C) a Mean = \(\frac {sum \, of \, observations}{Total \, number \, of\, observations}\) = \(\frac {(a-2d)+(a-d)+(a+d)+(a+2d)}{4} = \frac {4a}4 =a\) Correct option is: C) a

Mean of a – 2d, a – d, a + d and a + 2d is A) -a B) 3a C) a D) 5a

Answer»

Correct option is: C) a

Mean = \(\frac {sum \, of \, observations}{Total \, number \, of\, observations}\)

= \(\frac {(a-2d)+(a-d)+(a+d)+(a+2d)}{4} = \frac {4a}4 =a\)

Correct option is: C) a

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Mean of a – 2d, a – d, a + d and a + 2d is A) -a B) 3a C) a D) 5a

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