An automobile manufacturer introduces a new model that averages 27 miles per gallon in the city. A person who plans to purchase one of these new cars wrote the manufacturer for the details of the...
An automobile manufacturer introduces a new model that averages 27 miles per gallon in the city. A person who plans to purchase one of these new cars wrote the manufacturer for the details of the...
Heights of adult women in the United States are normally distributed with a population mean of μ = 63.5 inches and a population standard deviation of σ = 2.5. A medical researcher is planning to select...
If X~N(10,3) and Y~N(15,8), and if X and Y are independent, what is the probability distribution of 1. X +Y 2. X-Y 3. 3X 4. 4X + 5Y If X and Y...
Hi, I have a study of three different treatment with pre and post treatment result. It is like: ...
A new drug will not be considered for acceptance by Health Canada unless it causes serious side effects in less than 0.01percent of the population. In a trial with 80,000 people, 9 suffered...
The length of time what a space rocket component functions is approximately normally distributed. A sample of 20 of these components showed a mean of 900hours with a standard deviation of 87 hours...
standard deviation of 2.5 inches. In order to serve in the U.S. Army, women must be between 58 inches and 80 inches tall. What percentage of women are ineligible to serve based on their height? I...
A new drug will not be considered for acceptance unless it causes serious side effects in less than 0.01percent of the population. In a trial with 80,000 people, 9 suffered serious side effects...
What is the IQ score of the person at the 79th percentile? I got 81 but I don't know if I'm doing it right
What percent of students scored greater than 410?
Suppose that replacement times for washing machines are normally distributed with a mean of 10 years and a standard deviation of 1.4 years. Find the replacement time that separates the top 18% from...
Florida Hurricanes: The following distribution for X = annual number of hurricanes in the state of Florida was reported in an article entitled “What Seasonal Hurricane Forecasts Mean to Florida”. X=#...
Question/Problem: Identify the distribution (normal, Student t, chi-square) that applies to each of the following situations. (If none of the three distributions is appropriate, then so state...
Question: Identify the distribution (normal, Student t, chi-square) that applies to each of the following situations. (If none of the three distributions is appropriate, then so state.) a...
The average time a customer spends waiting in the check-out line at Wal-Mart is seven minutes. If wait times are independent and constant, what is the probability the customer will spend between eight...
The computed test statistic (rounded to two decimal places) for a claim about a population proportion given x = 12, n = 25, p = 0.35, assuming a normal distribution is 1.86.
Suppose an exam had an average (mean) score of 55% and a standard deviation of 15%. Table 6.3 Curving Grades A 1.5 standard deviations above the mean...
I slept 7.5 hours A previous study administered to US adults showed that the amount of sleep (in hours) they get in a 24 -hour period is normally distributed with a mean of 7 hours...
A random variable x has a normal distribution in the 50th percentile for x is 5. What is the mean of x?
How to solve?