So, no matter the units, the probability of X ≤ a is the same as the probability of a standard normal variable being less than (a − m)/s. If mu is the average and sigma the standard error, which of...

So, no matter the units, the probability of X ≤ a is the same as the probability of a standard normal variable being less than (a − m)/s. If mu is the average and sigma the standard error, which of the following R code would give us the right answer in every situation:

A. mean(X

B. pnorm((a - m)/s)

C. pnorm((a - m)/s, m, s)

D. pnorm(a)