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07 Oct 2022, 03:00
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C
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Difficulty:
15%
(low)
Question Stats:
84% (00:43) correct
16%
(00:54)
wrong
based on 51
sessions
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What is the average (arithmetic mean) of the ages of Mark, Paul, Edward, Maxine, and Linda?
(1) The average (arithmetic mean) of the ages of Mark, Paul, and Edward is 20 years.
(2) The average (arithmetic mean) of the ages of Maxine and Linda is 25 years.
(1) The average (arithmetic mean) of the ages of Mark, Paul, and Edward is 20 years.
(2) The average (arithmetic mean) of the ages of Maxine and Linda is 25 years.
07 Oct 2022, 09:01
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We need to find What is the average (arithmetic mean) of the ages of Mark, Paul, Edward, Maxine, and Linda?
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Theory
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=> To find the Average age of Mark, Paul, Edward, Maxine, and Linda we need to find Sum of the ages of Mark, Paul, Edward, Maxine, and Linda and divide it by 5
STAT 1: The average (arithmetic mean) of the ages of Mark, Paul, and Edward is 20 years.
=> Sum of the ages of Mark + Paul + Edward = 20*3 = 60
But we don't know the age of Maxine and Linda => NOT SUFFICIECT
STAT 2: The average (arithmetic mean) of the ages of Maxine and Linda is 25 years.
=> Sum of the ages of Maxine + Linda = 25*2 = 50
But we don't know the age of Mark, Paul, and Edward => NOT SUFFICIECT
Combining both of them we get the sum of the age of Mark, Paul, Edward, Maxine and Linda => SUFFICIENT
So, Answer will be C.
Hope it helps!
Watch the following video to Learn the Basics of Statistics
============================================================
Theory
- ‣‣‣ Mean or Average = (Sum Of All The Numbers) / (Total Number Of Numbers)
‣‣‣ Sum of All the numbers = Mean * Total Number of Numbers
============================================================
=> To find the Average age of Mark, Paul, Edward, Maxine, and Linda we need to find Sum of the ages of Mark, Paul, Edward, Maxine, and Linda and divide it by 5
STAT 1: The average (arithmetic mean) of the ages of Mark, Paul, and Edward is 20 years.
=> Sum of the ages of Mark + Paul + Edward = 20*3 = 60
But we don't know the age of Maxine and Linda => NOT SUFFICIECT
STAT 2: The average (arithmetic mean) of the ages of Maxine and Linda is 25 years.
=> Sum of the ages of Maxine + Linda = 25*2 = 50
But we don't know the age of Mark, Paul, and Edward => NOT SUFFICIECT
Combining both of them we get the sum of the age of Mark, Paul, Edward, Maxine and Linda => SUFFICIENT
So, Answer will be C.
Hope it helps!
Watch the following video to Learn the Basics of Statistics
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