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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?

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  • Category:- Statistics and Probability
  • Reference No.:- M919867

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