Question

I need help with number 13. thanks

12.) 〉 Í . xi. 143 13.) n y(xi-i). | 48.95

Answer 1

$x_i$	$f_i$	$x_if_i$	$x_i^2$	$(x_i-\overline x)^2$	$\\ f_i$$(x_i-\overline x)^2$
6	8	48	36	25	200
6	-10	-60	36	25	-250
-7	2	-14	49	64	128
3	13	39	9	4	52

$\\ n=\sum^n_{i=1}f_i=13\\ \\ \overline x=\frac{1}{n}\sum^n_{i=1}f_ix_i=\frac{13}{13}=1$

$\\ \frac{1}n\sum^n_{i=1}f_i(x_i-\overline x)^2=\frac{130}{13}=13$

13