The weight of baby seals is believed to be normally distributed, with a mean of 69.5 pounds. the average weight of a random sample of 25 baby seals is found to be 69.75 pounds, with a standard deviation of 4.2 pounds. what is the standard error of the mean?
0.84
0.30
0.25
0.17
we are unable to determine the standard error of the mean because we do not know σ.

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

c

step-by-step explanation: