Question

find the average of all even number between 5 and 15​

Answer 1

Step-by-step explanation:

6,8,10,12,14

1. avg=6+8+10+12+14/5
2. avg=50/5
3. average=10

Answer 2

Answer:

an=a+(n-1)d

14=6+(n-1)2

8=(n-1)2

4=(n-1)

n=5

S5=n/2(2a+(n-1)d

S5=5/2(2*6+4*2)

S5=5/2*20

S5=50

average=50/5=10