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MAS291 - Lý Ánh Dương
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Past experience has indicated that the breaking
strength of yarn used in manufacturing drapery material is normally distributed and that
σ = 2 psi. A random sample ofnine
specimens
is tested, and theaverage breaking strength is found
to be 98 psi
. Find a 95% two-sided confidence intervalon the
true mean breaking strength.
Suppose that the log-ons to a computer network
follow a Poisson process with an average of three counts per
minute.
Determine x such that the probability that at least one count
occurs before time x minutes is 0.95.
Which of the following diagrams is a stem-and-leaf diagram of this sample?
94, 90, 92, 91, 91, 86, 89, 91, 91, 90, 90, 93, 87, 90, 91, 92, 89
The amount of time that a customer spends waiting
at an airport check-in counter is a random variable with mean
8.2 minutes and standard deviation 1.5 minutes.
Suppose that a
random sample of n = 49 customers is observed. Find the probability that the average time waiting in line for these customers is less than 8 minutes.
Given the cumulative distribution
function
= 16 is selected from
a normal population with a mean of 75 and a standard deviation of 8.
A second random sample of size n2= 9 is taken from
another normal population with mean 70 and standard deviation 12. Let
Given the histogram of a sample data.
Which statement is true about this sample?