Find size of the sample to estimate test scores with 90% confidence, being sure that result will be within 3 points of the true population mean µ. Standard deviation= 12. (Don’t forget to round everything up – conservatively) ( find Z-a/2, Error, n).

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crhockey08crhockey08

10.02.2022

Mathematics

Same as the one before a few way back.... so...check the picture below, then we use the pythagorean theorem

$\bf (2s+9)^2=s^2+(2s+6)^2
\\\\\\
4s^2+36s+81=s^2+4s^2+24s+36\implies 36s+81=s^2+24s+36
\\\\\\
0=s^2-12s-45\implies 0=(s-15)(s+3)\implies 
\begin{cases}
0=s-15\\
\boxed{15=s}\\
-----\\
0=s+3\\
-3=s
\end{cases}$

The length of the longer leg of a right triangle is 6cm more than twice the length of the shorter le

The length of the longer leg of a right triangle is 6cm more than twice the length of the shorter le

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