## hawkfalcon Evaluate for m and evaluate the equation one year ago one year ago

1. hawkfalcon

let $x1=6, x2=8,x3=9, x4=13. Evaluate m=\sum_{i=1}^{4}x1$

2. hawkfalcon

Then use the values of x1, x2, x3, x4, and m to evaluate $\frac{ \sum_{i=1}^{4}(x1=m)^2 }{4 }$

3. hawkfalcon

Noone?:(

4. eseidl

Isn't the first equation just telling you to add up x1, x2, x3 and x4...or am I missing something?

5. hawkfalcon

no, xsubscript 1

6. Mikael

Hi there, the first just asks you their sum

7. hawkfalcon

Wait what seriously?

8. hawkfalcon

The e thingy with the i = 1 is saying add them up?

9. Mikael

10. eseidl

yep

11. hawkfalcon

o.O

12. Mikael

the "thingy" is subscript i (small hard to read ;) )

13. eseidl

just add them. I think the equation should read:$\sum_{i=1}^{4}x_i$

14. eseidl

where m is the sum.

15. eseidl

The second equation asks you to take the sum of the squares of x1, x2, x3 and x4

16. eseidl

and then divide by four :)

17. hawkfalcon

sorry, i couldn't connect. It is a 1, not an i.

18. hawkfalcon

@Mikael

19. eseidl

Well, that is kind of a strange question. Because, if x1=6, then$\sum_{i=1}^{4}6=4(6)=24$

20. eseidl

Similarly,$\frac{\sum_{i=1}^{4}(6)^2}{4}=\frac{4(36)}{4}=36$