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A piggy bank contains one penny, one nickel, one dime, and one quarter. It is shaken until two coins fall out at random. What is the probability that at least $0.30 fall out?
Time spent using email per session is normally distributed with μ = 8 minutes and σ = 2 minutes. a) What is the probability that the sample mean is between 7.8 and 8.2 minutes?
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?
a kinesiologist would like to compare the left hand and right hand gripping strengths of left-handed individuals. a
What is the shape mean and standard deviation of the resulting distribution of the sample mean? What is the probability that the mean of the sample of 42 is more than 52 hours?
an emergency breakdown service suggests that 50 of all drivers are registered with their service. a random sample of
In a survey of the 3000 boy scouts in the National Capital Area Council (NCAC), it is found that they have a mean weight of 135 lbs with a standard deviation of 15 lbs. How many of the boy scouts have weights between 120 lbs and 150 lbs.?
a 2007 study reported in science magazine stated that fifth-grade teachers scored a mean of 3.4 out of 7 points for
Based on these results, the proportion of the variation in 1993 winnings that is explained by the average number of putts per round and driving distance
A random sample of n=100 observations is selected from a population with mean of 29 and sandard deviation of 21. Approximate the probabilities shown below
At the .05 significance level, test the claim that the proportion of all children in the town who suffer from asthma is 11%.
a certain type of yarn is manufactured under specifications that the mean tensile strength must be 20 pounds. a random
a sample of 144 students is taken from a population of 2000 high school students to estimate the proportion of students
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