Population mean =25 Standard deviation =2.5 n=64 sample mean =25.65
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Population
Standard deviation =2.5
n=64
sample mean =25.65
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20 =
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- Heights of 2-year-old boys are normally distributed with mean of 28 inches and a standard deviation of 2.4. What is the chance a 2 year old boy is less than 26 inches tall? What is the chance a 2 year old boy is more than 20 inches tall?8. mean = 23.8; standard deviation = 5,2The retirement age of National Football League (NFL) players is Normally distributed with a mean of 33 years and a standard deviation of 2 years. What percentage of NFL players retire before age 32? The distribution of average hours of sleep per weeknight among college students is found to be Normally distributed, with a mean of 6.5 hours and a standard deviation of 0.7 hour(s). What percentage of college students sleep between 5.8 and 7.7 on average?
- What is the probability of a homeless having a score between 20 and 25? Mean= 26.8 Standard deviation= 7.4What are mean and standard deviation for the heights of people in that country? What is your z-score with these new parameters? The average height for Pilipino men are 5 foot, 3.7 inches with a standard deviation of 2.92 inches. The average height for Pilipino women are 4 foot, 11 inches with a standard deviation of 2.8 inches.What is the verbal SAT score such that only 16% of admitted students had a higher score? Mean=660 Standard Deviation = 40
- 10. mean = 54.2; standard deviation = 12,3Why do smaller standard deviations yield more peaked frequency distribution?Suppose the total weight of passengers and luggage on an airline flight is normally distributed with mean 8914 and standard deviation 32 What is the 2.28th percentile of total passenger weight
- Lengths of pregnancies of women are normally distributed with a mean of 266 days and a standard deviation of 16 days. What percentage to the nearest hundredth of children are born from pregnancies lasting more than 274 days? What percentage to the nearest hundredth of children are born from pregnancies lasting less than 246 days?A manufacturer of rechargeable batteries took a sample of 16 batteries from day’s production and used them continuously until they were worn out. The number of recharged until failure were: 20, 25, 26, 27, 20, 26, 31, 32, 22, 19, 20, 22, 28, 29 26, and 28.: (2 decimal places only) Find the: mean median modeThe gestation period of humans follows a normal distribution with a mean of 266 days and standard deviation of 16 days. If random samples of 15 pregnancies are studied, what is the mean and standard error of th sampling distribution of the sample mean? mean of the sampling distribution [ Choose ] standard error of the sampling distribution [ Choose ]
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