The mean score on a math test at milby high school was 50. the standard deviation was 10. If the same test was administered to the entire school district of 8th grade students, find the probability that the mean of the population(district) will be between 40 and 60. Assume normal distribution. Find the critical values for 0.05 two tail, 0.02 right tail,0.10 left tail, .10 two tail