Statistics Homework

1. Suppose that IQ scores in one region are normally distributed with a standard deviation of 18. Suppose also that exactly 55% of the individuals from this region have IQ scores of greater than 100 (and that 45% do not) What is the mean IQ score for this region? Carry your intermediate computations to at least four decimals places. Round your answer to at least one decimal place

2. A newspaper article reported that people spend a mean of 7 hours per day watching TV, with a standard deviation of 2.0 hours. A psychologist would like to conduct interviews with the 15% population who spend the most time watching TV. She assumes that the daily time people spend watching TV is normally distributed. At least how many hours of daily TV watching are necessary for a person to be eligible for the interview? Carry your intermediate computation to at least four decimal places. Round your answers to one decimal place.