5.2 Notes (Cont.) Binomial Probabilities Calculator Tips

TI 83 Calculator Tips Under Dist select binompdf to perform a single binomial calculation. Once you have selected this choice you should see on your screen binompdf( Following the open parenthesis you need to provide n, p, and r separated by commas so that the screen now reads binompdf(n,p,r) where n, p, and r are the corresponding values from the problem. Let’s reexamine Ex. 2 59% of internet users are concerned about privacy. From a random sample of 10 users, find the probability that exactly 6 of them will be concerned. binompdf(___,____,___)

What if we wanted to know the probability that between 0 and 2 inclusively were concerned. P(0) = P(1) = P(2) = However we have another option, binomcdf finds the sum of the probabilities for 0 through r successes out of n trials, P(0-r) = binomcdf(n,p,r) so for P(0-2) we could have entered binomcdf(___,____,___) +

What if we want to know the probability of at least 6? P(0-10) = 1 P(0-5) + P(6-10) = 1 P(6-10) = 1 – P(0-5) Therefore, P(6-10) = 1 – P(____) = 1 – binomcdf(___,_____,___)

Ex. 3 The seeds of a given hybrid of plant have a 70% chance of germinating. a) What is the probability of exactly 8 seeds germinating out of 10 seeds planted? b) What is the probability of at most 3 seeds germinating out of 10 seeds planted? c) What is the probability of at least 8 seeds germinating out of 10 seeds planted? d) What is the probability of at least 8 seeds not germinating out of 10 seeds planted?

Assignment p. 192 #10 (c – don’t compare or use table), 11, 12, 13, 15, 16 a-c