Question

find the product of class mark and frequency for the class 19 to 21 and frequency 23​

Answer 1

Answer:

class mark=19+21/2

=40/2=20

frequency =23

A.T.Q

Frequency *class mark

=23*20=460Ans.....

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Answer 2

Answer:

The product of class mark and frequency for the class 19 to 21 and frequency 23​ is 460

Step-by-step explanation:

• Class mark is the average of the upper limit and the lower limit of the class interval.
• It is also the middle point of the class interval.
• If a is the upper point of the class and b is the lower point of class, then class mark is given by

        $Class\ mark=\frac{a+b}{2}$

• For the given class 19 to 21, class mark is given by

          $Class\ mark=\frac{a+b}{2}$

          $Class\ mark=\frac{19+21}{2}\\Class\ mark=20$

• Frequency of the class is 23
• The product of the class mark and the frequency is given by

       $P=20\times 23\\P=460$