Question : The arithmetic mean of the following data is _________. 23, 17, 20, 19, 21
Option 1: 20
Option 2: 19
Option 3: 23
Option 4: 21
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Correct Answer: 20
Solution : Arithmetic mean $=\frac{\text{Sum of observations}}{\text{Number of observations}}$ $=\frac{23 + 17 + 20 + 19 + 21}{5}$ $=\frac{100}{5}$ $=20$ Hence, the correct answer is 20.
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Question : The arithmetic mean of the following numbers 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7 is:
Option 1: 4
Option 2: 5
Option 3: 14
Option 4: 20
Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? 15, 17, ?, 33, 47, 65
Option 1: 30
Option 2: 21
Option 3: 20
Option 4: 23
Question : If the arithmetic mean of $3a$ and $4b$ is greater than 50, and $a$ is twice $b$, then the smallest possible integer value of $a$ is:
Option 2: 18
Option 3: 21
Option 4: 19
Question : Directions: In the following question, select the related number from the given alternatives. 841 : 29 :: 289 : ?
Option 1: 23
Option 3: 17
Option 4: 13
Question : The frequency distribution data is given below. If the average age is 17 years, the value of m is: Age (in years): 8, 20, 26, 29 Number of people: 3, 2, m, 1
Option 1: 1
Option 2: 2
Option 3: 3
Option 4: 4
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