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...
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...
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?
in a standard normal distribution, above which z-score do approximately 57% of the data lie?
Normally distributed mean = 150g standard deviation = 16g
a=0.09 for a right-tailed test. Find the critical Z value used to test a null hypothesis.
2. Consider the problem facing security personnel at a military facility in the Southwest. Their job is to detect infiltrators (spies trying to beak in). The facility has an alarm system to assist...
I need help with this math problem for me to graduate high school. I really really need the help.
the filling machine used by a dairy company to fill 1 kg containers of yoghurt produces output which follows a normal distribution with mean 1030g (slightly more than 1kg) and standard...
The filling machine used by a dairy company to fill 1kg containers of yoghurt produces output which follows a normal distribution with mean 1030g (slightly more than 1kg) and standard deviation 20g...
1) The lengths in minutes of feature films for the current year follow a normal distribution with a mean of 109 minutes and a standard deviation of 12 minutes. What percentage of feature films in...
Suppose exam scores form an approximately normal distribution that has μ = 500 points and σ = 100 points. Letter grades on the exam were distributed as follows: Ds made up 16% of the exam, Cs 30%,...
The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.3 miles per gallon. (a) What proportion...
how do I calculate the probability X1 > X2 where X1 and X2 are independent, normally distributed random variables?
The gpa at best university has a normal distribution with a mean of 2.46 and a standard deviation of 1.13. Approximately what percent of the best university students have their gpa below 1.54?
z- Score is 1.4