If Five Arithmetic Means Are Instead Between -9 And 9 . What Is The Third Mean Using This Formula An=A1+(N-1)D
if five arithmetic means are instead between -9 and 9 . what is the third mean using this formula an=a1+(n-1)d
Answer:
3rd Arithmethic mean is 0
Step-by-step explanation:
Five arithmethic mean between
-9,_,_,_,_,_,9
a1=-9
an=9
n=7
d=?
find d
using an=a1+(n-1)d,
substitute
9=-9+(7-1)d
9=6d−9
6d=18
d=3
Find 3rd mean
Find a4
an=a1+(n-1)d
a1=-9
n=4
d=3
a4=-9+(4-1)3
a4=−9+(3)(3)
a4=−9+9
a4=0
#JuneChallenge
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