Using it's concept, it is found that the mean absolute deviation (MAD) of the data set is of 2.8.
The mean absolute deviation of a data-set is the sum of the absolute value of the difference between each observation and the mean, divided by the number of observations.
In this problem, the mean is:
Hence, the mean absolute deviation is:
The mean absolute deviation (MAD) of the data set is of 2.8.
A similar problem is given at brainly.com/question/22355667
The weight in fourth grade was 75 pounds.
A percentage is a value that indicates hundredth part of any quantity.
To convert percentage into a fraction it is divided by 100.
Given that,
The present weight of the sixth grader is 90 pounds,
And, the percentage of present weight with respect to fourth grade is 120%.
Suppose his weight in fourth grade was x pounds.
Now, the given problem can be written in the form of expression as below,
120% of x = 90
⇒ (120 / 100) × x = 90
⇒ x = 90 × (100 / 120)
⇒ x = 90 × (5 / 6)
⇒ x = 75
Hence, the weight of the sixth grader in fourth grade was 75 pounds.
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