3. In the past, schools in Los Angeles County have closed an average of 3 days each year for weather emergencies. a. Wha

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3 In The Past Schools In Los Angeles County Have Closed An Average Of 3 Days Each Year For Weather Emergencies A Wha 1 (93.32 KiB) Viewed 42 times

3. In the past, schools in Los Angeles County have closed an average of 3 days each year for weather emergencies. a. What is the probability that schools will close for 4 days next year? b. What is the probability will close for less than 4 days next year? 4. In New York State, the mean salary for high school teachers in 2019 was $81,410 with a standard deviation of $9,500. Assume New York's state salaries follow a normal distribution. a. What percent of new York's state high school teachers earn between $70,000 and $75,000. b. What percent of new York's state high school teachers earn between $75,000 and $90,000. c. What percent of new York's state high school teachers earn more than $90,000. d. 90% of all high school teachers in New York state earn less than what amount? 5. Human Resources Consulting (HRC) surveyed a random sample of 60 Twin Cities construction companies to find information on the costs of their health care plans. One of items being tracked is the annual deductible that employees must pay. The Minnesota Department of Labor reports that historically the mean deductible amount per employee is $502 with a standard deviation of $100. a. Compute the standard error of the sample mean for HRC. b. What is the chance that HRC finds a sample mean between $477 and $527? c. What is the probability the sample mean less than $450?