JSS3 First Term Mathematics Lesson Note – Statistics

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WEEK 8

TOPIC: Statistics

CONTENT:

(a)        Data presentation (Revision)

(b)        Range of a set of values

DATA PRESENTATION

RANK-ORDERED LIST

Rank order means arranging data values from the highest to the lowest.

Example

Some JCSE students scored these grades in a revision test: C, B, D, A, C, C, E, B, D, F, B, D, E, C, A, C, D, B. Represent the data in rank order.

Solution

Here is the rank order list from A to F:

A, A, B, B, B, B, C, C, C, C, C, D, D, D, D, E, E, F

FREQUENCY TABLE

A frequency table shows the number of times a value appears. A frequency table can be prepared for a give data set data either vertically or horizontally.

Example

In a class of 30 students seated in six rows of five students each, the class monitor records the following dates of births, row by row.

Wed.          Thur.             Sun.           Tue          Fri.

Mon.          Wed.             Tues.         Fri.           Sun.

Sun.            Wed.             Mon          Tues.       Sat.

Fri.              Sat.                Sun.           Thur.      Wed.

Mon.          Sat.                Sun.           Fri.          Mon

(a)        Represent the above data in a frequency table.

(b)        How many students were born on Tuesdays?

(c)        In what date were most students born?

(d)        In what date were the least number of students born?

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