4. Using data provided in Table 8.5 in the textbook and Excel software, regenerate the p-chart shown in Figure 8.18 in textbook. The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal, with mean 266 days and standard deviation 16 days. 1 . What percent of pregnancies last less than 270 days (about 9 months)? 2. What percent of pregnancies last between 240 and 270 days (roughly between 8 and 9 months)? 3. How long do the longest 20% of pregnancies last? 4. Using data provided in Table 8.5 in the textbook and Excel software, regenerate the p-chart shown in Figure 8.18 in textbook. The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal, with mean 266 days and standard deviation 16 days. 1 . What percent of pregnancies last less than 270 days (about 9 months)? 2. What percent of pregnancies last between 240 and 270 days (roughly between 8 and 9 months)? 3. How long do the longest 20% of pregnancies last