What is the standard deviation of a binomial distribution with 50 trials and p = 0.4?
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What is the standard deviation of a
binomial distribution with 50 trials
and p = 0.4?
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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?What is the value of the F-statistic if one sample has a standard deviation of 0.00436 and another sample has a standard deviation of 0.0057?The mean of the commute time to work for a resident of a certain city is 27.3 minutes. Assume that the standard deviation of the commute time is 7.1 minutes. What minimum percentage of commuters in the city has a commute time within 2.5 standard deviations of the mean? What are the commute times within 2.5 standard deviations of the mean?
- The 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?If the waiting time at DG’s drive-in-window is normally distirbuted with mean of 13 minutes and a standard deviation of 2 minutes, then what percentage of customers wait longer than 10 minutes but less than 15 minutes?For males in a certain town, the systolic blood pressure is normally distributed with a mean of 105 and a standard deviation of 5. Using the empirical rule, determine the interval of systolic blood pressures that represent the middle 68% of males.
- Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.168.16 and a standard deviation of 1.511.51. Using the empirical rule, what percentage of American women have shoe sizes that are less than 9.679.67? Please do not round your answer.What is the verbal SAT score such that only 16% of admitted students had a higher score? Mean=660 Standard Deviation = 40Data from the advising center shows the wait times as a normal distribution with the average as 20 min and a standard deviation as 5 min. Using the empirical rule, what percent of students wait between 15 and 25 minutes? What percent wait more than 20 min? Using the empirical rule, what is the chance that someone waits less than 5 min?
- A sample of 20 observation is selected from a normal population, the sample mean is 2.78 and the standard deviation is 0.83. Another sample of 18 observation was selected and the mean is 2.63 with standard deviation of 0.75. Test at 0.01 level of significance. What is the computed value and decision.What raw score for age corresponds to a z- score of +4.50, given a mean of 12.0 years and a standard deviation of 4.0 years?A given distribution has a population mean, 128 and a population standard deviation, oof 5. Compute the raw, -value associated with a Z-score of 0.19.