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Determine how many days before the due date the cesarean section should be carried out so that there is no more than a 10 percent chance that the woman will go into labor before that date.
Best electronics, inc. offers a ''no hussle'' returns policy. the number of items returned per day follows the normal distribution. Is there any chance of a day with no returns?
A bank lobby has four video cameras positioned to view the entire lobby. Any one of the four is sufficient to monitor the lobby. Each camera functions independently and has a reliability of 0.90, t
Studies have found that the distribution of the wingspan of bald eagles is approximately normal with a mean of 80 inches and a standard deviation of 4 inches.
If the stocks from "socially conscious" companies are different from the mean P/E ratio of all other major stocks. Please conduct a complete hypothesis test and find the p-value.
What would be the minimum sample needed to estimate the population mean of the length of carrots using Gro-Haut to within 1.5 cm with 99% confidence?
A lawyer researched the average number of years served by 45 different justices on the Supreme Court. The average number of years served was 13.8 years with a standard deviation of 7.3 years. What i
Find the 90% confidence interval for the standard deviaiton of the ages of seniors at Oak Park College if a sample of 24 students has a standard deviation of 2.3 years. Assume the variable is normal
If Puck Chuck wanted to reset the machine so that only 17 in 1000 pucks would have velocities of less than 75 mph, what would the mean output of the machine be set to?
a) What type of probability distribution is presented? b) Find the probability that exactly 5 of his saplings will die in that first winter. Round to 4 decimal places.
In his haste to get to class, he stuffs each letter into one of the preaddressed envelopes and seals them. What is the probability that each letter is in the correct envelope?
Suppose (unknown to you) the mean height of all male students is 70 inches. you measure 25 students. what is the sampling distribution of their average height x bar?
The heart rate in beats per minutes of 30 randomly selected students are given below: Is it normal distribution or find the normal distribution.
In a survey 500 people were asked if they ate breakfast 64% said they ate a good breakfast. The rest were in a hurry to eat breakfast. Suppose the true population proportion is 68%. What is the prob
Assuming that the standard deviation and the normal shape are unchanged, to what level must the mean reduce so that 20 gallons per week is the third quartile rather than the mean?
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a
A private medical clinic wants to estimate the true mean annual income of its patients. The clinic needs to be within $100 of the true mean. The clinic estimates that the true population standard de
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both wil
Records over the past year show that 1 out of 315 loans made by Mammon Bank have defaulted. Find the probability that 5 or more out of 300 loans will default. Hint: Is it appropriate to use the Pois
a light bulb has a standard deviation of 30 hours and a mean of 800 hours. What is the probability the bulb will last at least 860 hours?
A tomato picked from a tree in a certain vineyard has a 15% chance of being too ripe. What is the probability that exactly 3 tomatoes in a randomly selected tray of 20 tomatoes will be too ripe. In
The MPG (Miles per Gallon) for a mid-size car is normally distributed with a mean of 32 and a standard deviation of .8. What is the probability that the MPG for a selected mid-size car would be less
The average price for a new home in a certain neighborhood is $275,000 with a standard deviation of $20,000. What is the probability that a particular home will cost between $280,000 and $300,000 ?
Find a 95% confidence interval for the mean of all possible yields obtained using catalyst XA-100.
Is there convincing evidence that the proportion of American adults who oppose reinstatement of the draft is greater than 0.7? Use a significance level of 0.05.