At Indiana Dunes State park the maximum allowable standard for swimming in the lake are 235 colonies of E. coli per 100 ml of water (source). In order to measure this, 10 different measurements of E. coli are taken each day at different locations in the lake near the beach. On a given day, the 10 measurements were 118, 175, 190, 206, 207, 208, 249, 256, 260, and 289. Assuming the underlying distribution of E. coli counts is normal, construct a 99% confidence interval for the true mean number of colonies of E. coli per 100 ml of water.

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answer: your gay

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you dont know math

geometry: triangles

solvers

lessons

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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

6 cm

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