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given a numeric grade return a letter grade
LETGRADE(g)character vector of grades
numeric grade between 1-100
Jonathan M. Lees<jonathan.lees@unc.edu>
returns a grade based on a 4 point spread
g = rnorm(25, m=82, sd=10)
g[g>100] = 100
g[g<1] = 1
L = LETGRADE(g)
cbind(g, L)
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