1 - binomcdf(48,0.25,18)

I note there is an example you did a while back followed by a, well written, annotated explanation from another member.

Binomial distribution with The cumulative distribution function (binomcdf)

http://web2.0calc.com/questions/airlines-often-sell-more-tickets-for-a-flight-than-there-are-seats-because-some-ticket-holders-do-not-show-up-for-the-flight-assume-that-an#r4

Binomial distribution with The cumulative distribution function

1 - binomcdf(48,0.25,18)

Number of trials 48

Probability of success on a single trial 0.25

Number of successes (x) 18

This discreet value is subtracted from one giving the Cumulative Probability of: P(X < 18)

=0.9816

 The calculator give all values: The discreet, and the cumulative inclusive and exclusive of the discreet in both directions.

Here is a good on-line calculator:  http://stattrek.com/online-calculator/binomial.aspx

Answers:  0.982, 0.577

If you need to calculate these by hand and need help, ask.

Many calculators have a binomcdf function.

What does this question mean please Geno?

Thank you :)