Normal Probability : Sampling Distribution
Not what you're looking for?
Please provide help with this sample. I had miss this lecture last week and seem to be confuse towards getting the answer. See the attached file.
The amount of time a bank teller spends with each customer has a population mean, u, of 3.10 minutes and standard deviation, of 0.40 minute. If you select a random sample of 16 customers,
A. What is the probability that the mean time spent per customer is at least 3 minutes?
B. There is an 85% chance that the sample mean is less than how many minutes?
C. What assumption must you make in order to solve (a) and (b)?
D. If you select a random sample of 64 customers, there is an 85% chance that the sample mean is less than how many minutes?
Purchase this Solution
Solution Summary
The solution provides step-by-step method for the calculation of probability using the Z score. Formula for the calculation and Interpretations of the results are also included.
Purchase this Solution
Free BrainMass Quizzes
Probability Quiz
Some questions on probability
Solving quadratic inequalities
This quiz test you on how well you are familiar with solving quadratic inequalities.
Exponential Expressions
In this quiz, you will have a chance to practice basic terminology of exponential expressions and how to evaluate them.
Multiplying Complex Numbers
This is a short quiz to check your understanding of multiplication of complex numbers in rectangular form.
Graphs and Functions
This quiz helps you easily identify a function and test your understanding of ranges, domains , function inverses and transformations.