UPSKILL MATH PLUS

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The following table gives the number of pages written by Sarika for completing her own book for \(30\) days :
 
 Number of pages written per day  \(16-18\) \(19-21\)  \(22-24\)   \(25-27\)  \(28-30\)
 Number of days  \(1\) \(3\)  \(4\)  \(9\)  \(13\) 
 
Find the mean number of pages written per day.
 
Answer:  
 
The mean is .
 
[Note: Enter the answer in to two decimal number.]