# Stats Library

## Statistics Assignment Library

1. ##### Solved (Free): The probability that first processing machine is not working properly at any time is 0.07
The probability that first processing machine is not working properly at any time is 0.07, and the probability that the second machine is not working properly at any time is 0.07 and the probability that third machine is not working...
2. ##### Solved (Free): New born elephant calves usually weigh between 200 and 250 pounds until october 2006
Newborn Elephant Weights. New born elephant calves usually weigh between 200 and 250 pounds until october 2006, that is. an asian elephant at the Houston (Texas) zoo gave birth to a male calf weighing in at a whopping 384 pounds!...
3. ##### Solved (Free): The mean amount spent by all customers at an organic food market is estimated to be
The mean amount spent by all customers at an organic food market is estimated to be \$48, and the standard deviation is estimated to be \$12. According to Chebyshev's Theorem, at least what percentage of customers would be expected to...
4. ##### Solved (Free): A contractor decides to build homes that will include the middle 80% of the market. If the average size of homes built is 1810 square feet
A contractor decides to build homes that will include the middle 80% of the market. If the average size of homes built is 1810 square feet, find the maximum and minimum sizes of the homes the contractor should build. Assume...
5. ##### Solved (Free): A study of drinking and driving has found that 40% of all fatal auto accidents are attributed to drunk drivers
A study of drinking and driving has found that 40% of all fatal auto accidents are attributed to drunk drivers, 2% of all auto accidents are fatal, and drunk drivers are responsible for 20% of all accidents. Find the percentage...
6. ##### Solved (Free): A site is composed of 60% sand and 40% silt in separate layers and pockets. At this site
A site is composed of 60% sand and 40% silt in separate layers and pockets. At this site, 10% of sand samples and 5% of silt samples are contaminated with trace amounts of arsenic. If a soil sample is selected...
7. ##### Solved (Free): If the mean number of cigarettes smoked by pregnant women is 16 and the standard deviation is 8
If the mean number of cigarettes smoked by pregnant women is 16 and the standard deviation is 8, find the probability that in a random sample of 100 pregnant women the mean number of cigarettes smoked will be more than...
8. ##### Solved (Free): ABC Company claims that the proportion of its employees investing in individual investment accounts is higher than national proportion
ABC Company claims that the proportion of its employees investing in individual investment accounts is higher than national proportion of 50%. A survey of 100 employees in ABC Company indicated that 58 of them have invested in an individual investment...
9. ##### Solved (Free): A group of students at a school takes a history test. The distribution is normal with a mean of 25, and a standard deviation of 4
A group of students at a school takes a history test. The distribution is normal with a mean of 25, and a standard deviation of 4. (a) Everyone who scores in the top 30% of the distribution gets a certificate....
10. ##### Solved (Free): Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed with a mean of 250 feet and a standard deviation of 50 feet
Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed with a mean of 250 feet and a standard deviation of 50 feet. A. If X = distance in feet for a fly ball,...