A recent study of teacher salaries in rural areas showed that the average salary was $30,000/year with a standard deviation of $3,000. A) Using the same salary and standard deviation, find the probability that 1 teacher will earn more than $28,000/year

The mean cost of domestic airfares in the United States rose to an all-time high of $400 per ticket. Airfares were based on the total ticket value, which consisted of the price charged by the airlines plus any additional taxes and fees. Assume domestic airfares are normally distributed with a standard deviation of $110. Use Table 1 in Appendix B. a.  What is the probability that a domestic airfare is $560 or more (to 4 decimals)?  b.  What is the probability that a domestic airfare is $240 or less (to 4 decimals)?  c.  What if the probability that a domestic airfare is between $300 and $470 (to 4 decimals)?  d.  What is the cost for the 4% highest domestic airfares? (rounded to nearest dollar)$  or - Select your answer -morelessItem 5

A report claimed that children between the ages of 2 and 5 watch an average of 25 hours of television per week. Assuming the variable is normally distributed and the standard deviation is 3 hours. If 40 children between the ages of 2 and 5 are randomly selected, find the probability that the mean of the number of hours they watch television will be greater than 26.3 hours.

The annual income for a sample of 450 part-time students is normally distributed with a mean income of $31,000 and a standard deviation of $3,000.   What is the probability their annual income is more than $35,000?