Question

what is the arithmetic mean of 1,2,.............,9 and 10​

Answer 1

hey brainly user

here is ur answer

Answer:

the answer is 5.5

Step-by-step explanation:

$given \: numbers = 1to \: 10$

$mean=\frac{sum \: of \: all \: observations}{number \: of \: observations}$

$= \frac{1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10}{10}$

$= \frac{55}{10} = 5.5$

hope the answer helps

Answer 2

Answer:

mean = 5.5

Step-by-step explanation:

Given:

Series : 1,2,.............,9 and 10

To find : Airthemaric mean

Apply formula

$\boxed{\bold{\mathsf{mean= \frac{Sum\: of \: all \: terms }{Number \: of\: terms }}}}$

Now to find sum of 1,2........10

Apply formula

$\boxed{\bold{\mathsf{Sum \: of \: n \: numbers = \frac{ n(n+1)}{2} }}}$

Put n = 10

$= \frac{10(10 + 1)}{2} \\ \\ = \frac{10 \times 11}{2} \\ \\ = 55$

Put in the values in:

$\boxed{\bold{\mathsf{mean= \frac{Sum\: of \: all \: terms }{Number \: of\: terms }}}}$

$= \frac{55}{10} \\ \\ = 5.5$

Answer we get mean = 5.5

$\rule{200}{1}$

★In general A.M of two numbers let be a & b

$\boxed{\bold{\mathsf{A.M= \frac{a +b}{2}}}}$