._ a Solve the problem. 7) The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 7) 74 inches, and a standard deviation of 12 inhes. 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) 01587 C) 0.4580 D) 08413 ' 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 L/ 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