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If Mean of a, a + 3, a + 6, a + 9 and a + 12 is 10, then a is equal to;1. 12. 23. 34. 4 |
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Answer» Correct Answer - Option 4 : 4 Given: Observations = a, a + 3, a + 6, a + 9 and a + 12. Mean = 10 Formula used: Mean(a) = sum of observations/number of observations Calculation: According to the question, Mean(a) = sum of observations/number of observations ⇒ (a + a+ 3 + a + 6 + a + 9 + a + 12)/5 = 10 ⇒ (5a + 30)/5 = 10 ⇒ 5(a + 6)/5 = 10 ⇒ a + 6 = 10 ⇒ a = 4 ∴ a is equal to 4. |
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