Question

Consider the following set of ages of students is a college seminar.

Answer 1

1)
`\sum\limits_(i=2)^(6)x_(i)=116`

2)
`\sum\limits_(i=1)^(4)x_(i)=87`

Step-by-step explanation:

Given that
`x_(1)=21,x_(2)=23,x_(3)=22,x_(4)=21,x_(5)=24,x_(6)=26,x_(7)=28`

1) Given that
`\sum\limits_(i=2)^(6)x_(i)`

To find
`\sum\limits_(i=2)^(6)x_(i)`

Expanding the sums below to solve it

`\sum\limits_(i=2)^(6)x_(i)=x_(2)+x_(3)+x_(4)+x_(5)+x_(6)`

`=23+22+21+24+26` (adding the terms )

`=116`

Therefore
`\sum\limits_(i=2)^(6)x_(i)=116`

2) Given that
`\sum\limits_(i=1)^(4)x_(i)`

To find
`\sum\limits_(i=1)^(4)x_(i)`

Expanding the sums below to solve it

`\sum\limits_(i=1)^(4)x_(i)=x_(1)+x_(2)+x_(3)+x_(4)`

`=21+23+22+21` (adding the terms )

`=87`

Therefore
`\sum\limits_(i=1)^(4)x_(i)=87`