Microsoft Office Tutorials and References
In Depth Information
BETAINV
Is a logical value that determines the form of the function. If TRUE,
then BINDOMIST returns the cumulative distribution function (the
probability that there are no more than number_s successes). If
FALSE, then BINOMDIST returns the probability mass function (the
probability that there are exactly the number_s successes).
CUMULATIVE
The cumulative binomial distribution (when the cumulative argument is TRUE) is:
The binomial probability mass function (when the cumulative argument is FALSE) is:
where
is the COMBIN(n,x) mathematical function, described in Chapter 10, “Math and Trigonometr y
Functions.” (1- p) is the probability of failure and is sometimes denoted by q.
Figure 11.3 shows an example of the BINOMDIST function used to calculate the probabilities
that a manufactured piece of equipment will pass a safety test. When the cumulative
argument is FALSE, the probability is about 1% that the safety test will be passed exactly 9 out of 10
trials. Using the TRUE cumulative argument, the probability is almost 100% that the safety
test will be passed in 1 to 9 of the 10 trials.
Figure 11.3
The Percent column
displays the BINOMDIST
results formatted as a
percentage and rounded
to one decimal place.
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