Solve the problem. 7) The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 74 inches, and a standard deviation of 12 inches. What is the probability that the mean annual snowfall during 36 randomly picked years will exceed 76.8 inches? A) 0.5808 B) 0.0026 C) 0.4078 D) 0.0808 8) The scores on a certain test are normally distributed with a mean score of 51 and a standard 8 deviation of 2. What is the probability that a sample of 90 students will have a mean score of at least 51.2108? A) 0.3174 B) 0.1587 C) 0.4580 D) 0.8413 9) Random samples of size 25 are selected from a population with a mean of 45 and a standard 9) deviation of 15. The mean of all the sample means is A) 15 B) 60 C) 45 D) 3 10) As the sample size increases, the standard error fo the mean 10 A) remains the same B) cannot be determined C) decreases D) increases