I need help in my Statistics (math) homework, They are 5 trials, each with probability of success (correct) given by P= .20 or 20%.
Question is
Find the probability that the number x of correct answer is AT LEAST 3.
The answer i got is 0.943
>>152195
(.2)^3(.8)^2 * (5 choose 3) + (.2)^4(.8)^1 * 5 + .2^5 = 0.05792 exactly
>>152224
thank you soo much
Would it be the same if its MORE THAN 2?
>>152363
yes
>>152385
thanks