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A group of 30 employees of Cadre A has a mean age of 27. A d
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11 Apr 2019, 15:58
11 Apr 2019, 15:58
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A group of 30 employees of Cadre A has a mean age of 27. A different group of 70 employees of Cadre B has a mean age of 23. What is the mean age of the employees of the two groups together?
(A) 23
(B) 24.2
(C) 25
(D) 26.8
(E) 27
(A) 23
(B) 24.2
(C) 25
(D) 26.8
(E) 27
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A group of 30 employees of Cadre A has a mean age of 27. A d
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07 Jun 2020, 03:34
07 Jun 2020, 03:34
Theory: Mean = \(\frac{Sum Of All Value}{Total Number Of Values}\)
We need to find the mean age of the combined group, and we know that Mean = \(\frac{Sum of all the values}{Total number of values}\)
We know total number of people = 30 + 70 = 100
Let's try to find the sum of all the ages now.
Group 1: A group of 30 employees of Cadre A has a mean age of 27
=> Sum = Mean * 30 = 27*30 = 810
Group 2: A group of 70 employees of Cadre A has a mean age of 23
=> Sum = Mean * 70 = 23*70 = 1610
Total Age of both the groups combined = 810 + 1610 = 2420
Mean = \(\frac{Total Age of both the groups combined }{ Total Number of people}\) = \(\frac{2420}{100}\) = 24.2
So, answer will be B
Hope it helps!
To learn more about Statistics watch the following video
We need to find the mean age of the combined group, and we know that Mean = \(\frac{Sum of all the values}{Total number of values}\)
We know total number of people = 30 + 70 = 100
Let's try to find the sum of all the ages now.
Group 1: A group of 30 employees of Cadre A has a mean age of 27
=> Sum = Mean * 30 = 27*30 = 810
Group 2: A group of 70 employees of Cadre A has a mean age of 23
=> Sum = Mean * 70 = 23*70 = 1610
Total Age of both the groups combined = 810 + 1610 = 2420
Mean = \(\frac{Total Age of both the groups combined }{ Total Number of people}\) = \(\frac{2420}{100}\) = 24.2
So, answer will be B
Hope it helps!
To learn more about Statistics watch the following video
Re: A group of 30 employees of Cadre A has a mean age of 27. A d
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14 Feb 2023, 13:23
14 Feb 2023, 13:23
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Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
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