A fair coin is tossed 20 times and the number of heads is counted. Complete parts (a) through (d). a. Use the binomial distribution to find the probability of getting 3 heads. The probability of getting 3 heads is (Round to four decimal places as needed.) b. Use the binomial distribution to find the probability of getting at least 3 heads. The probability of getting at least 3 heads is (Round to four decimal places as needed.) c. Use the binomial distribution to find the probability of getting 3 through 6 heads. The probability of getting 3 through 6 heads is (Round to four decimal places as needed.) d. Use the normal approximation to the binomial distribution to approximate the probabilities in (a) through (c). Use the normal distribution to approximate the probability of getting 3 heads. Ne