# Finding variance and mean

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#1
I don’t really understand what they want here, which videos can I watch on this concept exactly?
Last edited by Eris13696; 1 month ago
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1 month ago
#2
TL maths. What exactly don't you understand from the textbook?
Last edited by username3477548; 1 month ago
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1 month ago
#3
https://youtu.be/eZB1TdtO7zQ
Are you familiar with the summation symbol?
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#4
(Original post by tej3141)
https://youtu.be/eZB1TdtO7zQ
Are you familiar with the summation symbol?
Yeah I know this, I’m sorry if this is a silly question, but do they mean (x-5)=314 and 5 is the mean, then I understand how to get the x but I don’t get why we added 314 to it
Last edited by Eris13696; 1 month ago
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1 month ago
#5
(Original post by Eris13696)
Yeah I know this, I’m sorry if this is a silly question, but do they mean (x-5)=314 and 5 is the mean, then I understand how to get the x but I don’t get why we added 314 to it
No that's not what it means. Essentially, it's saying that if you subtracted 5 from the weights of all 97 pieces of hand luggage(to get a new weight), then added all the new weights together, you would get 314. So, if you do 314 +(5x97), you will get the actual weight of all the pieces of hand luggage - sigma(x)
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#6
(Original post by tej3141)
No that's not what it means. Essentially, it's saying that if you subtracted 5 from the weights of all 97 pieces of hand luggage(to get a new weight), then added all the new weights together, you would get 314. So, if you do 314 +(5x97), you will get the actual weight of all the pieces of hand luggage - sigma(x)
I see!! thank you for the explanation
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