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

Question

asked Apr 18, 2021 42.3k views

1 Answer

Stephjang · Answer 1 · 2021-04-24T04:54:22+0000

Answer:

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