A sample is selected from a population with a mean of μ = 65 and a standard deviation of σ = 15. If the sample has n = 9 scores, what are the expected value of M and the standard error of M?

geometry: triangles

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call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584

126 maybe. sorry

answer: 8d

step-by-step explanation:

45+5= 50+5=55+5=60