According to one poll, 42% of households in a certain region still had landline phone service. Suppose a random sample of 50 households from the region is taken. Complete parts (a) through (d) below. a. Find the probability that exactly 20 of the households sampled still have a landline. The probability that exactly 20 still have a landline is |:. (Type an integer or a decimal. Round to three decimal places as needed.)