How to solve them by steps

A gust-moodle-datafiles.s3.eu-de.cloud-object-storage.appdomain.cloud 56% 19. X is a normally distributed random variable with a mean of 8 and a standard deviation of 4. The probability that X is between 1.48 and 15.56 is a. 0.0222 b. 0.4190 C. 0.5222 d. 0.9190 ANS: D 20. X is a normally distributed random variable with a mean of 5 and a variance of 4. The probability that X is greater than 10.52 is a. 0.0029 b. 0.0838 C. 0.4971 d. 0.9971 ANS: A 21. Given that Z is a standard normal random variable, what is the value of Z if the area to the left of Z is 0.055 a. 0.4441 b. 1.59 C. 0.0000 d. 1.50 ANS: B