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The random variable X is normally distributed with mean μ and variance σ(squared). Given that P(X > 58.37) = 0.02 and P(X < 40.85) = 0.01, find the mean and the standard deviation.
The mass of a small loaf of bread is normally distributed with mean 500 grams and standard deviation of 20 grams. Find the probability that a randomly selected loaf has a mass not exceeding 470g.
Suppose the monthly income of assistant managers of our local banks are normally distributed with mean of Php40,000 and a standard deviation of Php5,000. What is the z score for an income of Php30,0
Determine the exact probability of creating a mini license plate with an R. Give solution exactly in reduced fraction form.
Use the pictured Excel output to determine whether the error percentages for the computerized system differ from those for the manual system at the .05 level of significance. What do you conclude?
A three digits number is to be formed from the digits 1 through7, with no digit being used more than once. How many such number would be less than 289?
Based on N(80,20) normal model, what are the cutoff values for
What is the probability that it will be possible to buy a rush ticket. What is the average number of rush tickets available?
Using N(-80,20) Normal model, what percentage of distribution
Assume the probability that an item produced by the certain machine will be defective is 0.1. Determine the probability that the sample of 10 items will contain at most one defective item. Suppose t
Specialty's senior sales forecaster predicted that the demand would be basically distributed with the mean as 20,000 units and that demand would be between 10,000 and 30,000 units with a 90% probab
Determine the standard error of the mean in this example? Compute the likelihood the sample mean is greater than 320 minutes? Estimate the likelihood the sample mean is between 320 and 350 minutes?
A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Compute the probability the sample mean is:
At the fencing center, 60% of fencers employ the foil as their main weapon. We randomly survey 25 fencers at the fencing center. We are interested in the numbers that don't employ the foil as their
A school newspaper reporter decides to randomly survey 12 students to see if they attend Tet festivities this year. Based on past years, she knows that 18% of studetns attend Tet festivities. We are
Using the sales forecaster prediction to calculate, what is the standard deviation for the demand distribution?
When the data form the 2x2 matrix, the phi-coefficient is employed to determine effect size for the chi-square test for the independence. If other factors are held constant, how does sample size aff
A two-tailed test of hypotheisis was conducted and 60 values were above the median. Computed z=1.61. At the 0.05 level, what is the decision regarding the null hypothesis?
Discuss what is measured through the sample standard deviation. Calculate the estimated standard error for the sample mean and explain what is measured by the standard error.
Suppose the random variable X is best described by a normal distribution with mean= 150 and standard deviation= 15. Find the values of x such that
Come up with an expression that the probability of Z will still be null after this. At the end of this procedure, what is the expected size of Z?
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
Make a 95% confidence interval estimate of the population mean rating for Miami. Enter your answer using parentheses and a comma, in the form (n1, n2).
Someone wonders if movies are too long. A random sample of 45 releases had a mean length of 112.1 minutes and a standard deviation of 22.4 minutes. Construct a 99% confidence interval for the mean l
The production foreman for the Florida fruit company determines that the average sale of the oranges is 4,700 and the standard deviation is 500 oranges. Sales follow the normal distribution. What i