Here we have
The z-score for X = 6150 is
The z-score for X = 6350 is
The required probability is
Answer: 0.6892
7. (4 points) Salaries of nurses in southern California are normally distributed with a mean of...
assume the salaries of elementary school teachers in the United States normally distributed with a mean of 32,000 and a standard deviation of 3,000. If 100 teachers are randomly selected, find the probability that their mean salary is less than 32,000
Assume that the electric bills of Southern California Edison are normally distributed with a mean of $100 and a standard deviation of $15. Find the bill amount such that 20% of the households have a bill higher than this amount.
The weekly salaries of teachers in one state are normally
distributed with a mean of 560.0 dollars and a standard deviation
of 39.0 dollars. What is the probability that a randomly selected
teacher earns more than 605.0 a week?
My answer, B, is not correct.
The weekly salaries of teachers in one state are normally distributed with a mean of 560.0 dollars and a standard deviation of 39.0 dollars. What is the probability that a randomly selected teacher earns more...
The salaries of the employees of a corporation are normally distributed with a mean of $25,000 and a standard deviation of $5,000. a. What is the probability that a randomly selected employee will have a starting salary of at least $31,000? b. What percentage of employees has salaries of less than $12,200? c. What are the minimum and the maximum salaries of the middle 95% of the employees? d. If sixty-eight of the employees have incomes of at least $35,600,...
Assume that the salaries of elementary school teachers in the United States are normally distributed with a mean of $32,000 and a standard deviation of $3000. If 100 teachers are randomly selected, find the probability that their mean salary is greater than $32,500.
The salaries of professional male dancers are normally distributed with a mean of $32,000 and a standard deviation of $3,000. What is the probability a randomly selected professional male dancer makes more than $36,000?
kly salaries of teachers in one state are normally distributed with a mean of $490 and a standard deviation of $45. What is the probability that a randomly selected teacher earns more than $525 a week? A) 0.2823 B) 0217 C) 0.7823 D) 0.1003
4. The mean age of 50 randomly selected teachers in southern California was 42.5. If it is known from other studies that the standard deviation of ages of all teachers is 8.75, (a) (2 points) Find the critical value a/2 or ta/2 that properly applies in this problem for 95% confidence interval. 05 (b) (2 points) Find the 95% confidence interval for the mean age of all teachers in southern California. Page (b) (e) (2 points) Find the margin of...
Problem 2 Salaries for new assistant professors at State College are normally distributed with a mean of $80000 and a standard deviation of $7000 We randomly survey 20 teachers from that district, let X be the salary of a randomly selected teacher at State, and let X be the average salary of 20 randomly selected teachers b. (3%) 8 ~ Ipick one, B ( c. (396) Find the probability that an individual teacher earns more than $65,000. P(X> 65000) d....
Problem 2 Salaries for new assistant professors at State College are normally distributed with a mean of $80000 and a standard deviation of $7000 We randomly survey 20 teachers from that district, let X be the salary of a randomly selected teacher at State, and let X be the average salary of 20 randomly selected teachers X- a. (3%) b. (3%) c. (396) (pick one) B X ~ tpick one, B Frd the probability that an individual teacher earns more...