Question

The Magazine Mass Marketing Company has received 16 entries in its latest sweepstakes. They know that the probability of receiving a magazine subscription order with an entry form is 0.5. What is the probability that no less than 6 of the entry forms will include an order? Round your answer to four decimal places. Using TI-84 Calc

Answer 1

Here we need use binomial CDF. Let X is a random variable shows the number of entry include an order. Here X has binomial distribution with parameters n=16 and p=0.5.

We need to find the probability .

To use TI 84 we need to find binomial CDF on calculator. First press 2nd, then vars and then goto binomial CDF as follow:

Press enter, and enter values as follows:

Press enter. Following is the output:

It gives you probability . That is

So the probability that no less than 6 of the entry forms will include an order is