Ti-83 Probability of events occurring

Question

First time here, more frequent over at StackOverflow. So not sure if calculator questions are accepted here, but I'll ask.

Is there a quick way to solve problems like this in the ti-83:

1. 82% shot success rate out of 7 shots taken, find odds of exactly 3 shots going in, more than 5 shots going in. (I know how to do the written out way using nCr but it would save time on the exam if I knew a faster way).

2. Lets say 10% of people pay $\$$30, 70% pay $\$$52, and 20% pay $\$$60. Is there a way to get the mean and standard deviation of that by modifying the stats on ti-83 (I know, very easy mean is (.1*30)+... just wondering if there a way without entering 30 1 time and 52 7 times and so on in L1 then calculating the 1 var stats.

Thanks!

Answer 1

Your first question, my first answer :-)

1a. 2nd--->distr--->binompdf--->(7, 0.82, 3) 1b. 1 - 2nd--->distr--->binomcdf--->(7, 0.82, 5) Note thats CDF, not pdf

1. Enetering 7 52's can be done easily, but I don't rememebr how. Sorry.