The table below shows the results of a study of the number of eggs per clutch for American robins.

Number of Eggs	2	3	4	5
Frequency	3	32	38	4

The cumulative relative frequency of a clutch size of 4 eggs is found by:

     $\displaystyle {C}{R}{F}=\frac{{{3}+{32}+{38}}}{{{3}+{32}+{38}+{4}}}$ 

Calculate this cumulative relative frequency accurate to three decimal places.