Probability using normal distribution.
An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings. The 100 filings showed the average preparation time of 90 minutes with a standard deviation of 140 minutes.
1. The intelligence Quotient test scores normally distributed with a mean of 100 and a standard deviation of 15. What is the possibility that a person would score 130 or more on the test?
2. What is the probability that a person would score between 85 and 115?