Help. I get so many different answers if I use ai and I don’t know how to do it

[dusty silo]

Its only about the 2 task

[sage warren]

First, get the class mark for each:
$x_i = \frac{\mathrm{upper\ limit}+\mathrm{lower\ limit}}{2}$

[inland oracle]

Suika

[sage warren]

For mean, use $\frac{\Sigma f_ix_i}{\Sigma f_i}$

[inland oracle]

Suika