Question

Find Arithmetic mean of even numbers among the first 10 natural numbers

Answer 1

mean=2+4+6+8+10/5=30/5=6

Answer 2

Answer:

Step-by-step explanation:

Here we get the even natural numbers-

2,4,6,.....,20

Here,

a=2      d=2      n=10     l=20

we know that-

Sn= n/2(a+l)

    = 10/2(2+20)                                                                                            (10/2=5)

    =5(22)

    = 110