HP Prime Graphing NW280AAABA manual Is a real number

Binomial Binomial probability density function. Computes the probability of k successes out of n trials, each with a probability of success of p. Returns Comb(n,k) if there is no third argument. Note that n and k are integers with k ≤ n .

BINOMIAL(n,k,p)

Example: Suppose you want to know the probability that just 6 heads would appear during 20 tosses of a fair coin.

BINOMIAL(20,6,0.5) returns 0.0369644165039.

Poisson Poisson probability mass function. Computes the probability of k occurrences of an event during a future interval given μ , the mean of the occurrences of that event during that interval in the past. For this function, k is a non-negative integer and

μis a real number.

POISSON(μ,k)

Example: Suppose that on average you get 20 emails a day.

What is the probability that tomorrow you will get 15?

POISSON(20,15) returns 0.0516488535318.

Cumulative

Normal Cumulative normal distribution function. Returns the lower-tail probability of the normal probability density function for the value x, given the mean, μ, and standard deviation, σ, of a normal distribution. If only one argument is supplied, it is taken as x, and the assumption is that μ=0 and σ=1.

NORMALD_CDF([μ,σ,]x)

Example:

NORMALD_CDF(0,1,2) returns 0.977249868052.

TCumulative Student's t distribution function. Returns the lower- tail probability of the Student's t-probability density function at x, given n degrees of freedom.

STUDENT_CDF(n,x)

Example:

STUDENT_CDF(3,–3.2) returns 0.0246659214814.

320 Functions and commands