Page 119 - Data Science class 10
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7. Edoardo Italy Fencing 1936–1960 Summer M 6 5 2 13
Mangiarotti
8. Ireen Wüst Speed 2006–2022 Winter F 6 5 2 13
Netherlands skating
9. Takashi Ono Japan Gymnastics 1952–1964 Summer M 5 4 4 13
The table above is the list of Olympic medals won over the full career of the players. This list includes athletes
who have won seven or more Olympic medals over their sporting career. Now if you are interested in finding only
woman athletes which have won, then you have to make a subset databased by sorting the gender column.
1.3. ONE-WAY FREQUENCY TABLE
Frequency means the number of times an event or a value occurs. A frequency table is a table that lists items and
shows the number of times the items occur.
Frequency tables are usually produced on individual variables. For categorical data, the table records the number
of observations (the frequency) for each unique value of the variable. The frequency table records the number of
observations falling in each interval. We represent the frequency by the English alphabet ‘f’.
For example, Viraj has to put the footballs in two boxes. He starts dropping one football after the other into two
boxes named A and B. Viraj drops the balls randomly, and after dropping 10 balls, he takes some rest and then
again repeats the task with the remaining 10 balls.
The tables given below show the pattern of how Viraj drops the footballs in two boxes.
Trial-1 Trial-2
Effort Ball drops in box Effort Ball drops in box
A or B A or B
1 A 1 B
2 B 2 B
3 A 3 A
4 A 4 A
5 A 5 A
6 A 6 A
7 B 7 B
8 A 8 A
9 B 9 B
10 A 10 A
Plotting the frequency of ball falling in box A in case of both the trials in one table.
Trials Frequency of balls dropping in box A
Trials - 1 7
Trials - 2 6
Such a table is known as the frequency table. We create the table by arranging collected data values and their
corresponding frequencies. The aim of constructing this table is to show the number of times a value occurs.
Use of Statistics in Data Science 117

