Suppose that samples of size n = 25 are selected at random from a normal population with mean 100 and standard deviation 10. What is the probability that the sample mean falls in the interval from μx - 2.00x to μx + 0.60x? Express your answer to four decimal places (e.g. 0.9876). The probability is i

A population has a mean of u=30 and a standard deviation of o=8. If a population distribution is normal, what is the probability of obtaining a sample mean greater than M=34 for a sample of N=4?

X is a normally distributed random variable with a mean of 5.00 and a standard deviation of 11.39.  If the right area is 0.4716 then what is the value of X?

A randomly selected sample of n = 55 individuals over 65 years old takes a test of memorization skills. The sample mean is x = 53, and the standard deviation is s = 6.9. Give the numerical value of the standard error of the mean, s.e. (Round your answer to two decimal places.) s.e.(x) =

The grade point average for ALL juniors at a large college has a standard deviation of 0.50.  A random sample of 20 students is to be used to estimate the population mean grade point average.  What condition do you need to verify prior to computing the probability of obtaining a sample mean within plus or minus 0.2 of the population mean?

A normal distribution has a mean of u = 60 with o- 8. If one score is randomly selected from this distribution, what is the probability that the score will be greater than X = 54?

The temperature distribution of city D has a population mean µ= 21.3, and standard deviation o = 4.8. You randomly select 12 days and get the temperature for these days. Then you compute the sample mean. What is the maximum sample mean value in the bottom 0.22 x 100% of the sample mean distribution? Note that we're talking about the distribution of the sampling mean. Give your answer to 2 decimal places.