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Equations from Curtis Cameron

#### Equations from Curtis Cameron

The following Solver equations have not been seen in print before. Key them into the Editor in Solver and save them for future reference.

Interpolate: (x-x1)/(x1-x2)=(y-y1)/ (y1-y2)

! finds (x,y) that is on a line between (x1,y1) and (x2,y2) !

Binomial Distribution: comb(n:x) *p1^x * (1-p1)^(n-x) = px

! prob that there will be exactly x occurrences in n tries, if the prob of one occurrence in one try is p1. With 10 coin flips, the prob that exactly three will be heads is 0.117 !

Great Circle:

Distance=69.0466* ACOS(SIN (LT1) * SIN(LT2)+COS(LT1) *

COS(LT2) * COS(LG1-LG2))

! finds the great circle distance in miles between two points on the earth. Must be in degrees mode. !

Horizon: d=sqrt(h/5280*(2*r+h/ 5280)) ! distance to the earth's horizon (in miles) for an observer h ft above surface, r should be 4000 miles. !

Curtis Cameron