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junior college 1 | H2 Maths
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to person “J” ... sorry i posted here as idk how to reply u with pic
Date Posted: 5 years ago
Views: 334
No worries. Actually what you can do is to submit the pic as an answer to your own question (like the one you did for this one)
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this is the CONTEXT to my qn above
Date Posted:
5 years ago
Usually there is no +c version as the convention is -c. Did you encounter +c somewhere eg. Some practice question?
i haven’t encountered +c before hence wondering if +c formula does exist. btw can help take a look at my workings in pencil ? i didn’t use the usual formula . i used some summation formula instead . do u think it’s legit
Aren't the workings in your picture based on the notes' formula itself? Looks ok to me
Btw if you happen to encounter +c, just remember that + c = - (-c).
So you'll just have to swap the c in the formula for the mean to -c. As for variance, +c or -c doesn't affect it since it's a constant.
So you'll just have to swap the c in the formula for the mean to -c. As for variance, +c or -c doesn't affect it since it's a constant.
thanks for the input ! looking forward to more in future
Welcome
actually i just uploaded my working ... didn’t realise that it hadn’t uploaded earlier ... haven’t grasped the app yet lol
can help me take a look pls ...
can help me take a look pls ...
done
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is method 2 correct ?
Date Posted:
5 years ago
Yes, perfectly logical.
From the formula
xbar = ∑(x-c) / n + c
= ∑x / n - ∑c / n + c
= ∑x / n - c + c
= ∑x / n
Your working and the formula's lead to the same result.
It's just that the formula saves you time and the steps.
From the formula
xbar = ∑(x-c) / n + c
= ∑x / n - ∑c / n + c
= ∑x / n - c + c
= ∑x / n
Your working and the formula's lead to the same result.
It's just that the formula saves you time and the steps.
thanks . appreciate loads
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