what are the advantages and disadvantages of mean mode and median
Answers
Median:
The median is that value of the series which divides the group into two equal parts, one part comprising all values greater than the median value and the other part comprising all the values smaller than the median value.
Merits of median
(1) Simplicity:- It is very simple measure of the central tendency of the series. I the case of simple statistical series, just a glance at the data is enough to locate the median value.
(2) Free from the effect of extreme values: - Unlike arithmetic mean, median value is not destroyed by the extreme values of the series.
(3) Certainty: - Certainty is another merits is the median. Median values are always a certain specific value in the series.
(4) Real value: - Median value is real value and is a better representative value of the series compared to arithmetic mean average, the value of which may not exist in the series at all.
(5) Graphic presentation: - Besides algebraic approach, the median value can be estimated also through the graphic presentation of data.
(6) Possible even when data is incomplete: - Median can be estimated even in the case of certain incomplete series. It is enough if one knows the number of items and the middle item of the series.
Demerits of median:
Following are the various demerits of median:
(1) Lack of representative character: - Median fails to be a representative measure in case of such series the different values of which are wide apart from each other. Also, median is of limited representative character as it is not based on all the items in the series.
(2) Unrealistic:- When the median is located somewhere between the two middle values, it remains only an approximate measure, not a precise value.
(3) Lack of algebraic treatment: - Arithmetic mean is capable of further algebraic treatment, but median is not. For example, multiplying the median with the number of items in the series will not give us the sum total of the values of the series.
However, median is quite a simple method finding an average of a series. It is quite a commonly used measure in the case of such series which are related to qualitative observation as and health of the student.
Mode:
The value of the variable which occurs most frequently in a distribution is called the mode.
Merits of mode:
Following are the various merits of mode:
(1) Simple and popular: - Mode is very simple measure of central tendency. Sometimes, just at the series is enough to locate the model value. Because of its simplicity, it s a very popular measure of the central tendency.
(2) Less effect of marginal values: - Compared top mean, mode is less affected by marginal values in the series. Mode is determined only by the value with highest frequencies.
(3) Graphic presentation:- Mode can be located graphically, with the help of histogram.
(4) Best representative: - Mode is that value which occurs most frequently in the series. Accordingly, mode is the best representative value of the series.
(5) No need of knowing all the items or frequencies: - The calculation of mode does not require knowledge of all the items and frequencies of a distribution. In simple series, it is enough if one knows the items with highest frequencies in the distribution.
Demerits of mode:
Following are the various demerits of mode:
(1) Uncertain and vague: - Mode is an uncertain and vague measure of the central tendency.
(2) Not capable of algebraic treatment: - Unlike mean, mode is not capable of further algebraic treatment.
(3) Difficult: - With frequencies of all items are identical, it is difficult to identify the modal value.
(4) Complex procedure of grouping:- Calculation of mode involves cumbersome procedure of grouping the data. If the extent of grouping changes there will be a change in the model value.
Mean:
Advantages
# It is very easy to calculate mean for a set of numbers.
# There is no need for detailed distribution to compute the mean.
Disadvantages
# Mean can be calculated for only quantitative data and not qualitative data.
# Mean cannot be represented graphically.
Median:
Advantages
# This can be calculated even if the number series is incomplete.
# Median can be used to represent the data graphically.
Disadvantages
# For a large dataset, computation can takes a long time.
Mode:
Advantages
# Mode can be determined for both numerical and non-numerical data.
# Mode can be graphically represented with a histogram.
Disadvantages
# A dataset can have one, more than one, or no mode at all.