MATH 534 Week 3 Homework Problems (v2) Keller

1. Scores on a certain exam are normally distributed with a mean of 90 and a variance of 25. What is th 2. Scores on a certain exam are normally distributed with a mean of 90 and a variance of 25. What is th 3. Which one of the following is not a characteristic of a normal distribution? X is normally distributed with mean 50 and standard deviation 4, what is P(45 < X < 58) ? 7. Suppose X is normally distributed with mean 20 and standard deviation 4, find the value x0 such that 9. In a recent year, the average daily circulation of the Wall Street Journal was 2,276,207. Suppose the s a. On what percentage of days would circulation pass 1,818,000? b. Suppose the paper cannot support the fixed expenses of a full-production setup if the circulation drop low, the production manager might try to keep the full crew in place and not disrupt operations. How of