Please help on 4,5 and 6

Question 4 0/1 pt 9 10 99 0 Details The lifespan of the Ebola virus on flat dry surfaces has a normal distribution with u = 2366.7 minutes and o = 37.7 minutes. You monitor a random sample of size n = 109. What is the mean of the distribution of sample means? Hi = What is the standard deviation of the distribution of sample means? (Report answer accurate to 2 decimal places. ) On = Submit Question Question 5 0/1 pt 9 10 2 99 @ Details A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 205.3-cm and a standard deviation of 0.6-cm. For shipment, 21 steel rods are bundled together. Find the probability that the average length of a randomly selected bundle of steel rods is between 205.2- cm and 205.5-cm. P(205.2-cm