3. Suppose we have a population {4, 9, 14-}. From this population, select all simple random samples of size two and construct the sampling distribution of the mean. 9. The tensile strength is normally distribution with mean 70 psi and standard deviation 5.1 psi. What is the probability that a sample of n = 6 specimens will have mean greater than 71 psi? 10. Ten measurements of impact energy are as follows 63.1 65.7 63.5 65.6 65.5 62.3 63.6 65.3 64.2 65.3 Assuming impact energy is normally distributed construct a 95% confidence interval for the mean impact energy. Interpret your result