I need solve this question

QUESTION 20 The weight of a Branflakes box of cereal has a mean of 500 grams and a standard deviation of 6 grams. If 16 boxes are randomly selected, then the distribution of the mean weight of these boxes is O Approximately normal with mean 500 grams and standard deviation 1.5 grams Exactly normal with mean 500 grams and standard deviation 6 grams O Can't be determined without more information O Exactly normal with mean 500 grams and standard deviation 1.5 grams QUESTION 21 The mean customer waiting time in a checkout line at Lulu Hypermarket is 26 seconds with a standard deviation of 5 seconds. Find the probability that the mean customer waiting time in a checkout line for a random sample of 64 Lulu customers does not exceed 27 seconds? Round your answer to 4 decimal digits. QUESTION 22 The mean time spent on watching Youtube videos per week by college students is 10 hours with a standard deviation of 2.4 hours. A simple random sample of 16 college students is chosen for a study of viewing habits. What is the probability that mean time spent on Youtube by the sampled students exceeds 10.6 hours? 0.8413 0.4013 Probability can't be computed from the given information. 0.1587