The average of the middle 80% of the series is option (E) 65.5 is the correct answer.
What is an average?
Average is the mean of the given numbers and is calculated by dividing the sum of given numbers by the total number of numbers.
For the given situation,
The series of numbers are 3,7, 39, 41, 57, 84, 91, 95, 110, 144.
The middle 80% of the numbers are 7, 39, 41, 57, 84, 91, 95, 110.
The formula of average of numbers is
[tex]Average = \frac{Sum of all numbers}{Total number of numbers}[/tex]
⇒ [tex]Average = \frac{7+39+41+57+84+91+95+110}{8}[/tex]
⇒ [tex]Average = \frac{524}{8}[/tex]
⇒ [tex]Average = 65.5[/tex]
Hence we can conclude that the average of the middle 80% of the series is option (E) 65.5 is the correct answer.
Learn more about the average here
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