Economic

20. The time required to assemble an electronic component is normaly distributed with a mean and a standard deviation of 24 minutes and 13 minutes, respectively. Find the probability that a randomly picked assembly takes between 19 and 27 minutes A) 0.2177 B) 0.2390 C) 0.4371 D) 0.2236 Show your work for full credit. 21. Suppose that NWEA scores for 6" graders follow a normal distribution with a mean of 200 and a standard deviation of 20. What is the percentage of students who have on NWEA score between 160 and 2607 A) 95 44%% B) 06.24%% C) 97.58% D) 97.72%