Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
A little z-score refresher… Name: 1. For a normal distribution, find the z-score location that separates the distribution as follows: a) Separate the highest 30% from the rest of the distribution. b) Separate the lowest 40% from the rest of the distribution. c) Separate the highest 75% from the rest of the distribution. 2. Suppose that SAT scores among U.S. college students are normally distributed with a mean of 500 and a standard deviation of 100. a) What is the probability that a randomly selected individual from this population has an SAT score at or below 600? b) What is the minimum score necessary to be in the top 15% of the SAT distribution? c) Find the range of values that defines the middle 80% of the distribution. A little z-score refresher… Name: 1. For a normal distribution, find the z-score location that separates the distribution as follows: a) Separate the highest 30% from the rest of the distribution. b) Separate the lowest 40% from the rest of the distribution. c) Separate the highest 75% from the rest of the distribution. 2. Suppose that SAT scores among U.S. college students are normally distributed with a mean of 500 and a standard deviation of 100. a) What is the probability that a randomly selected individual from this population has an SAT score at or below 600? b) What is the minimum score necessary to be in the top 15% of the SAT distribution? c) Find the range of values that defines the middle 80% of the distribution. 3. What percent of a normal population is more than 2 standard deviations above the mean? Data for the rest: Adult women’s heights are ND with μ = 65.5 in (5′5½″) and σ = 2.5 in. 1′ = 12″ (one foot = 12 inches 4. What percent of adult women have heights between 65.5 and 68 in (5′5½″ and 5′8″)? 5. What proportion of adult women have heights greater than 70.5 in (5′10½″)? 6. What’s the probability that a randomly selected adult woman is less than 63 in tall (5′3″)? 7. If a woman is 68 in (5′8″) tall, what’s her percentile rank? 3. What percent of a normal population is more than 2 standard deviations above the mean? Data for the rest: Adult women’s heights are ND with μ = 65.5 in (5′5½″) and σ = 2.5 in. 1′ = 12″ (one foot = 12 inches 4. What percent of adult women have heights between 65.5 and 68 in (5′5½″ and 5′8″)? 5. What proportion of adult women have heights greater than 70.5 in (5′10½″)? 6. What’s the probability that a randomly selected adult woman is less than 63 in tall (5′3″)? 7. If a woman is 68 in (5′8″) tall, what’s her percentile rank?