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Bro first make a proper table including cumulative frequency less than type,class,frequency and study the examples given in your textbook to solve it successfully ...Think yourself on the problem to understand better....
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so answer is 18 - 13 =5.
Step-by-step explanation:
see median = 18
n+1/2 =18
7+1/2=18
8/2=18
4th term =18
13 +f =18
f = 18-13
f = 5
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