Question

find the mean of the data(11-13)(13-15)(15-17)(17-19)(19-21)(21-23)(23-25) frequency-7,6,9,13,20,5,4​

Answer 1

Answer:

19.68

Step-by-step explanation:

FIND THE CLASS MARK. THEN MULTIPLY THE CLASS MARK AND THE FREQUENCY. IT WILL BE fiyi. FIND THE SUM OF THE FREQUENCY AND fiyi.

MEAN= SUM OF fiyi/ SUM OF FREQUENCY

* CLASS MARK = 11+13/2 (WAY TO FIND CLASS MARK)