Question 761969
a) Every test of head or tail is *independent* of the previous tests. Hence, even if we got 7 heads in 10 tests, the 11th attempt still has a probability of getting heads as 1/2 (as though every test is the first test)

b) To reach very close to 1/2 you have to conduct a very large number of trials (ideally, toss the coin infinite number of times!)


:)