4. (2 points) In google.com, search for "coin toss". You should get a page the simulation tool presented in the next figure: PLAGAN Figure 1. Google's coin flip application If a coin is fair, when flipped it should result in "Heads" or "Tails" with equal probability (50% of the time it results in "Heads" and 50% of the time it results in "Tails"). Create a function called unfair coin. The function will have the number w as its parameter. The function must return "Heads" with probability w and "Tails" with probability 1-w. For example, if w = 0.3, 30% of the time the function will return "Heads" and 70% of the time it will return "Tails" (note that here you are applying what you learned in problems 2 and 3).