Respuesta :
The correct answer is c. There is no possible way to know how much the mean age decreases, but we know it definitely will (averages decrease as values less than the average are added to the data.)
The new mean age will be less than 14.2 years.
What is mean?
There are several kinds of mean in mathematics, especially in statistics. For a data set, the arithmetic mean, also known as arithmetic average, is a measure of central tendency of a finite set of numbers: specifically, the sum of the values divided by the number of values.
According to questions, the mean age of a dance troupe is 14.2 years.
A 7-year-old sibling is invited to join the troupe.
We have to find how does the sibling’s age affect the mean.
There is no possible way to know how much the mean age decreases.
But the new mean age will decrease definitely.
Hence we can conclude that Option C is correct answer.
Learn more about mean here:
https://brainly.com/question/1906955?referrer=searchResults
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