Answer :
We shall use assumed mean method to find mean number of oranges.
So, while converting data into exclusive type won’t change any calculation in finding mean, we are however converting the inclusive data type to exclusive data type for better representation.
Mean is given by
⇒ 
⇒ Mean = 22 + 0.3125
⇒ Mean = 22.3125
Thus, mean number of oranges is 22.31.
We have used assumed mean method here, because of larger data values of fi’s. Assumed mean method gives result to accuracy and ease when data is large.
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