Central Tendency: Mean
Read this topicExplanations 2
- Mean Mean, as used in statistics, is one of the measures of central tendency. It is equivalent to the common usage of the word "average." How to calculate the mean The mean is d…
By Ivan Hu, Alex Federspiel
- Mean is Average To find the mean of a data set, you follow these steps: Add the data. Divide by number of data. Let's look at the set {546 389 165 478 93 1073 848}\{546 \ 389 \ …
By Amy Feraco
Problems 15
- Find the mean of the set 3,5,1,6,3,2,13,5,1,6,3,2,13,5,1,6,3,2,1.
- There are 555 numbers in a set. The mean of the lowest 333 numbers is 666, and the mean of the highest 333 numbers is 111111. If the average of all the numbers is 999, what is t…
- Let a1,a2,…,a2013a_1,a_2,\dots, a_{2013}a1,a2,…,a2013 be a permutation of the numbers from 111 to 201320132013. Let An=a1+a2+⋯+annA_n = \frac{a_1 + a_2 + \cdots + a_n} {n}An…
- What is the mean of the following set? {1,2,2,3,3,3,4,4,4,4,5,5,5,5,5}\{1,2,2,3,3,3,4,4,4,4,5,5,5,5,5\}{1,2,2,3,3,3,4,4,4,4,5,5,5,5,5}
- Your average score on eight exams is 757575. Then, you take a ninth exam and your average score on exams increases to 767676. What was your score on the ninth exam?
- Suppose that a group of 666 people have an average weight of 140140140 pounds, and they meet a group of 444 people with an average weight of 150150150 pounds. What is the averag…
- You are recording the ages of 100010001000 people in a spreadsheet. You accidentally entered one person's age as 200020002000 rather than 202020. What is the difference between …
- The arithmetic mean of 555 test scores was 828282. If the highest score was 909090, what was the mean of the remaining 444 scores?
- Suppose that you have 121212 scores, all of which are integers between 222 and 999 inclusive. If you know that 999 of the scores are greater than or equal to 666, what is the lo…
- What is the sum of all the possible values of xxx?
- Lynnelle took 101010 tests in her math class at Stanford. Her score on each test was an integer from 000 through 100100100. She noticed that, for every four consecutive tests, h…
- The median of the list n−6,n,n+2,n+2,n+7n-6, n, n+2, n+2, n+7n−6,n,n+2,n+2,n+7 is 4. What is the mean?
- The list n−2,n,n,n+2,n+4,n+8n-2, n, n, n+2, n+4, n+8n−2,n,n,n+2,n+4,n+8 has median 555. What is its mean?
- Which day has shorter total flight time?
- Suppose the average number of times a member goes to the gym each week is 222, and that 676767% of people do not use their membership at all. Among the people who actually use t…