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1. The probability that a system recovers from a rare cold spell is 0.35. If 80 systems are known to be affected by cold spell is a certain year, what is the probability that less than 40 recover?
2. Historical records of sewer pipe failures in an old city show that during the period 2005 to 2013, there were 30 failures that were catastrophic (exploded due to the build-up of methane or other gases). Assuming that the pipe failures follow a Poisson process, find the probability that
(a) 4 catastrophic failures occur within the next 6 months,
(b) the interval from now till the next catastrophic pipe failure will be at most 2 months
(c) The probability that no catastrophic pipe failure will occur in the next 12 months.
Focusing on Data Analysis: Using the data from Chapter 1: UWEC Undergraduates (pp. 30-31), and answer questions a,b,c,d,e,f,g (UWEC Undergraduates.
A statistical study reported that a drug was effective with a p-value of .042. (a) Is this true? An effective sample may be found about 42 times in 1000 samples.
Assuming that all the grades for this class follow a normal probability distribution, what is the minimum score that a student in this class has to get to receive an A grade?
suppose x has a poision distribution with a mean of .4. determine the following probabilitiesa
based on a random sampleof 25 units of a product the sample mean is 102 pounds with a standard deviation of 10 pounds.
A bag contains 4 chips of which one is red, one is blue, one is green, and one is yellow. A chip is then selected at random from a bag and then replaced in the bag.
In a random sample of 400 items, 88 are defective. If the null hypothesis is that 20% of the items in the population are defective, what is the value of ZSTAT?
How many dissimilar computer passwords are possible?
a water treatment plant needs to maintain the ph of the water in the reservoir at a certain level. to monitor this they
Jim owns three real estate offices in Anytown. He has decided to open one more office, but cannot decide between hometown or uptown as the towns where he wants to locate.
annual per capita consumption of milk is 21.6 gallons statistical abstract of the united states 2006. being from the
in 2011 a sruvey by the american bar association indicated that the average yearly income of attorneys was 110000. a
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