find the arithmetic mean between 3 and 21?with solution
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find the arithmetic mean between 3 and 21?with solution
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Verified answer
Answer:
The arithmetic mean between the arithmetic extremes is 12.
Step-by-step explanation:
Given: ,
Find:
Formula:
Solution:
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Answer:
12
Step-by-step explanation:
3,__,21
an=a1+(n-1)d an=21, a1=3, n=3,d?
find the common difference or the d first by using the formula
an=a1+(n-1)d
21=3+(3-1)d
21=3+2d
21-3=2d
18=2d
18/2=2d/2
9=d 9 is the common difference
Add the first number by the common difference which is 9 in order to find the arithmetic mean between 3 and 21
3+9=12+9=21 12 is the arithmetic mean between 3 and 21