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Normal distribution

Could someone tell me how to work out question 5ED04D0CB-06FA-4A06-A8C1-A33BA1C3C6F3.jpg.jpeg
Original post by Hannahkisley
Could someone tell me how to work out question 5ED04D0CB-06FA-4A06-A8C1-A33BA1C3C6F3.jpg.jpeg


What percentage of the distribution are the quartiles?
Original post by ghostwalker
What percentage of the distribution are the quartiles?


I don’t know, that’s all the information you’re given
the symmetry of the curve will help you to predict the mean...
Normal distribution is meant to be symmetrical, right? So if the 25% and 75% mark are there, you should have your answer quite easily. For the S.D, isn't there an equation to work it out, using the mean?
(edited 5 years ago)
Original post by Hannahkisley
I don’t know, that’s all the information you’re given


You do know. "Quartiles" - 25%, 75%.
Original post by ghostwalker
You do know. "Quartiles" - 25%, 75%.


Ahh, thank you!

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