7. Suppose that the blood cholesterol level of all men aged 20 to 34 follows a normal
distribution with mean y = 188 milligrams per deciliter (mg/dl) and standard deviation o = 41
mg/dl. in an SRS of size 100, find the probability that X estimates y to within t3 mg/dl.

g

step-by-step explanation:

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

c

step-by-step explanation: