(1) a sample of 36 ball have been randomly pull out of jar. it contained 16 red balls. what is the probability of that happening? do you still believe that jar contains 25% red balls?

There is a .41025...% chance of that happening. moving on the jar is not 25% filled with red balls because 25% of 36 is only 9 and he pulled out 16 red balls hence forth that is impossible if the jar is only 25% red balls 

hope this helped!!!