If Z follows standard normal distribution, what is the probability that Z is in between 0.57 to 0.89?*

21.57%

9.76%

52.90%

31.33%

Suppose that a random variable X has a normal distribution with a mean of 40 and a standard deviation of 20. What is the probability that X is below 30?*

97.72%

30.85%

69.15%

2.28%