Ap stat | Mathematics | Page 1

glossy marlin Oct 10, 2025, 2:12 PM

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Ik it’s hard to read

rocky birchBOT Oct 10, 2025, 2:12 PM

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strong gull Oct 10, 2025, 2:50 PM

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your mean isnt 12000

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your finding it as if your mean is 12000

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but you want between 9000 and 12000

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@glossy marlin

glossy marlin Oct 10, 2025, 3:27 PM

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I’m pretty confused on this question. I’m not really sure if what I did was right or even how to do the rest @strong gull

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I also have to sketch a curve but idk how either 😭

strong gull Oct 10, 2025, 3:39 PM

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what is your mean?

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could you sketch the mean on a normal curve?

glossy marlin Oct 10, 2025, 3:44 PM

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The means 14k

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According to the top

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Is this right z_1=\frac{9000-14000}{4000}=-1.25
• z_2=\frac{12000-14000}{4000}=-0.50

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@strong gull

strong gull Oct 10, 2025, 3:56 PM

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yes

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do you know what to do now

thick sleet Oct 10, 2025, 10:35 PM

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You probably have a table of the cumulative distribution function (oftenly noted $\phi$) in annex with the specific value $z_1$ and $z_2$. Then your proportion is only the difference : $\phi(z_2) - \phi(z_1)$. Otherwise I don't see how you can compute it simply...

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