1. According to a recent study, 59% of households from a certain large region no longer have a landline and instead only have cell phone service. Suppose three households from the region are selected at random. a. The probability that all three have only cell phone service is (Round to four decimal places as needed.) b. The probability that at least one has only cell phone service is (Round to four decimal places as needed.) 2.Assume critical reading scores for a standardized test are distributed as N(560, 50). Complete parts (a) through (d) below. a. Find the test score at the 75th percentile. The 75th percentile is _ (Round to the nearest integer as needed.) b. Find the test score at the 25th percentile. The 25th percentile is _ (Round to the nearest integer as needed.) c. Find the interquartile range for test scores. The interquartile range is _ (Round to the nearest integer as needed.) d. Is the interquartile range larger or smaller than the standard deviation? The IQR is (larger or smaller) than the standard deviation