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Mean Word Problems
- A normal distribution has a mean (#3515)
A normal distribution has a mean of 80 and a standard deviation of 14...
- By the year 2020, in a land far away (#3103)
By the year 2020, in a land far away, the federal government requires car manufacturers to have a minimum of 30 miles per gallon (mpg) average over all the models it makes. Suppose that the GenYota company produces only five models with current mpg ratings of 21, 31, 22, 28, and 18. The manufacturer decides that it can only redesign the last of the models to meet the government requirement. What must the new mpg of this new fifth model be to meet the requirement for the five cars? (Round to the nearest mpg.)
- Each of a sample of 184 residents (#1375)
Each of a sample of 184 residents were asked how much they spent of lottery tickets. 124 responded with $0. The mean of the remaining was $20. The largest expenditure was $228...
- Find the IQ score separating the top (#1404)
Find the IQ score separating the top 85% from the ...
- In a class of 25 students (#2972)
In a class of 25 students, the grades were normally distributed with a mean of 78 and a standard deviation of 5. Sketch the normal curve for the distribution. What percentage of the students scored above an 88...
- Test for high school students (#2909)
Test for high school students with a 3.50 to 4.00 grade point average were normally distributed, with a mean of 38.8 and a standard diviation of 1.9. A student with a 3.5 to 4.00 grade point average who took the standarized tes is randomly ...
- With a height of 69 inches, Alexander was the shortest (#3097)
With a height of 69 inches, Alexander was the shortest president of a particular club in the past century. The club presidents of the past century have a mean height of 75.4 inches and a standard deviation of 2.7.
a. What is the difference between Alexander's height and the mean?
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