Is lack of sleep causing traffic fatalities? A study conducted under auspices of National Highway Traffic Safety Administration found that average number of fatal crashes caused by drowsy drivers each year was 1,550 (Business Week, January 26, 2004). Assume the annual number of fatal crashes per year is basically distributed with standard deviation of 300.
Determine the probability of fewer than 1,000 fatal crashes in a year (to 4 decimals)?
Determine the probability the number of fatal crashes will be between 1,000 and 2,000 for a year (to 4 decimals)?