Find the area to the left of a zscore of 1.95. 0.0256 ' 01711 0.9744 " 0.8289 QUESTION 18 The amount of rainfall in January in a certain city is normally distributed with a mean of 4.2 inches and a standard deviation of 0.5 inches. Find the value of the 25th percentile, rounded to the nearest tenth. ' ' 4.0 4.5 1.1 3.9 QUESTION 19 A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 460 seconds and a standard deviation of 50 seconds. Find the probability that a randomly selected boy in secondary school can run the mile in less than 345 seconds. 0.9893 " 0.4893 0.5107 ' 0.0107 QUESTION 20 Suppose that 80% of trees in a certain forest have a virus. We take a sample of 5 trees. Find the probability that exactly 4 have the virus. .6723 ' .0065 K .4096 .2048