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# can anyone help me with this please! watch

1. the weights in kg of the hand luggage carried on to a flight by 97 passengers is summarised by Σ(x-5)= 314 and Σ(x-5) = 1623

find Σx and Σx^2

i got Σx which is 799 but im not getting Σx^2 which is 7188
2. (Original post by parvatee)
the weights in kg of the hand luggage carried on to a flight by 97 passengers is summarised by Σ(x-5)= 314 and Σ(x-5) = 1623

find Σx and Σx^2

i got Σx which is 799 but im not getting Σx^2 which is 7188
If you want help with this I would suggest posting your working.
3. sure
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4. (Original post by parvatee)
sure
The x inside the sum bracket represents 97 different individual x values, so you can’t really proceed by trying to derive a single value of x.

The approach I would suggest is to expand (x - 5)^2 to x^2 - 10x + 25 then look at the separate sums of those three elements.

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