Question 5 1 Point If a variable Y has a normal distribution in a population, then it cannot be used to estimate the sample or population mean B the sample mean can be used to estimate the variable Y C the distribution of sample means is also normal D the sample mean usually falls outside one standard normal deviate of the population mean E the distribution of sample means is always skewed Question 6 1 Point A group of athletes all run a 100m sprint. The average of their times is 12.3s, with a standard deviation of 1.1s. If 8 athletes are randomly selected from the group, what is the probability that the average of their times will be greater than 11.45? A 0.99 B 0.9 C 0.05 D 0.01