An average, central tendency of a data set is a measure of the "middle" or "expected" value of the data set.It represents the whole series and conveys general idea of the whole group. There are many different descriptive statistics that can be chosen as a measurement of the central tendency of the data items. These include mean, the median and the mode. Other statistic symbols measures such as the standard deviation and the range are called measures of spread and describe how spread out the data is.We can see more examples of this type at mean median mode worksheets .
An average is a single value that is meant to typify a list of values. If all the numbers in the list are the same, then this number should be used. If the numbers are not the same, an easy way to get a representative value from a list is to randomly pick any number from the list. However, the word 'average' is usually reserved for more sophisticated methods that are generally found to be more useful. In the latter case, the average is calculated by combining the values from the set in a specific way and computing a single number as being the average of the set.
The most common method is the arithmetic mean but there are many other types of averages, such as median (which is used most often when the distribution of the values is skewed with some small numbers of very high values, as seen with house prices or incomes),let's see a example from algebra answers
Question:-
An Instructor has graded 19 exam papers submitted by students in a class of 20 students and the average so far is 70.(The maximum possible score is 100).To raise the class average by 1 point ,the score on the last paper has to be?
Answer:-
Average of 19 papers is 70
Total of 19 papers = 19 x 70 =1330
If the average of 20 papers be 71
Total of 20 papers should be 20 x 71 =1420
score of the 20 th paper should be 1420-1330=90
An average is a single value that is meant to typify a list of values. If all the numbers in the list are the same, then this number should be used. If the numbers are not the same, an easy way to get a representative value from a list is to randomly pick any number from the list. However, the word 'average' is usually reserved for more sophisticated methods that are generally found to be more useful. In the latter case, the average is calculated by combining the values from the set in a specific way and computing a single number as being the average of the set.
The most common method is the arithmetic mean but there are many other types of averages, such as median (which is used most often when the distribution of the values is skewed with some small numbers of very high values, as seen with house prices or incomes),let's see a example from algebra answers
Question:-
An Instructor has graded 19 exam papers submitted by students in a class of 20 students and the average so far is 70.(The maximum possible score is 100).To raise the class average by 1 point ,the score on the last paper has to be?
Answer:-
Average of 19 papers is 70
Total of 19 papers = 19 x 70 =1330
If the average of 20 papers be 71
Total of 20 papers should be 20 x 71 =1420
score of the 20 th paper should be 1420-1330=90
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