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Cardiac pacemaker batteries will stop working if they are not properly calibrated and charged. Suppose that the length of time a battery operates operates follows a normal disistribution with mean 25.0 days and standard deviation 2.0 days. At what point will 1% of the batteries will fail.
determine the area under the standard normal curve in parts a through c below. find the area under the normal curve to
If the campaign manager's claim is correct, what is the probability that the sample proportion would be no more than 0.49 for a sample of this size?
They plan to take a random sample of 100 runners who complete a marathon and record their temperatures. Which of the following will the researchers know after they have taken the sample?
About how many women had 30 or fewer minutes of exercise per day? The graph is bimodal. What are the two modes?
In the past, monthly sales for HOOPS, a small software firm, have averaged $20,000 with standard deviation $4000.
Find out the probability that disc doesn't touch line between two planks. Find out also expected distance from center of the disc to closest line between two planks.
in may of 2002 the gallup organization asked a random sample of 537 american adults this questionif you could choose
A player rolls a pair of dice five times. She scores a "hit" on any throw if she gets a 6 or 7. She wins iff she scores an odd number of hits.
A sample of n people is taken to obtain their opinion. The proportion p¯ in favor in the sample is taken as an estimate of p. Using the Central Limit Theorem, determine how large a sample will ensure that the estimate will, with probability .95, b..
A certain state lottery awards 418 prizes; 28-$200 prizes, 120-$25 prizes and 270-$20 prizes, for every 10,000 tickets sold.
For the following exercises, you do not use the Premiere Products database. 1. The DBA asks for your help in planning the data archive for the following Premiere Products database:
In a survey of a rare clumped species, the study area is divided into two strata, with N1 = 60 units in the first stratum and N2 = 50 units in the other. Initial simple random samples of sizes n1 = 3 and n2 = 2 are used.
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