{x | Xbelongs to N,x= 3n,x< 15}
find the answer
Answers
Answer:
Answer:
mean = 5.5
Step-by-step explanation:
Given:
Series : 1,2,.............,9 and 10
To find : Airthemaric mean
Apply formula
\boxed{\bold{\mathsf{mean= \frac{Sum\: of \: all \: terms }{Number \: of\: terms }}}}
mean=
Numberofterms
Sumofallterms
Now to find sum of 1,2........10
Apply formula
\boxed{\bold{\mathsf{Sum \: of \: n \: numbers = \frac{ n(n+1)}{2} }}}
Sumofnnumbers=
2
n(n+1)
Put n = 10
\begin{gathered}= \frac{10(10 + 1)}{2} \\ \\ = \frac{10 \times 11}{2} \\ \\ = 55\end{gathered}
=
2
10(10+1)
=
2
10×11
=55
Put in the values in:
\boxed{\bold{\mathsf{mean= \frac{Sum\: of \: all \: terms }{Number \: of\: terms }}}}
mean=
Numberofterms
Sumofallterms
\begin{gathered}= \frac{55}{10} \\ \\ = 5.5\end{gathered}
=
10
55
=5.5
Answer we get mean = 5.5