hawkfalcon
Evaluate for m and evaluate the equation



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

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

hawkfalcon
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Noone?:(

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

hawkfalcon
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no, xsubscript 1

Mikael
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Hi there, the first just asks you their sum

hawkfalcon
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Wait what seriously?

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

Mikael
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You simply misread

eseidl
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yep

hawkfalcon
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o.O

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

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

eseidl
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where m is the sum.

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

eseidl
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and then divide by four :)

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

hawkfalcon
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@Mikael

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

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