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Byju's Answer
Standard X
Mathematics
Sum of first n natural numbers
Arithmetic me...
Question
Arithmetic mean of
5
numbers is
27
. If one number is missed by mistake then Arithmetic mean is
25
. Find the missing number.
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Solution
A
.
M
.
=
s
u
m
o
f
n
u
m
b
e
r
s
n
Sum of the five numbers
=
27
×
5
=
135
Sum of remaining four numbers
=
25
×
4
=
100
⇒
missing number = 135 - 100 = 35
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