Help with Math Problem
I'm preparing for a Math Exam next Monday and this is a problem on a Past Paper. Could someone help me out (but don't provide the answer, just a hint please)?
A coin is biased so that when it is tossed the probability of obtaining heads is 2/3. The coin is tossed 1800 times. Let X be the number of heads obtained. Find:
a) The mean value of X
b) The standard deviation of X
Of course, a) is easy to find. The mean of X = (2/3)*1800 = 1200.
