Help~ tmolo test i cant figuar out this

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To find the electric field 2.5m from the center of a region with a charge density of ro=5.5E-15 R**(2.3), the bulk charge within the sphere can be calculated using the formula Q=(4/3)*Pi*(R^3)*ro. The discussion indicates that the answer in the back of the book is approximately 0.00241. Participants express difficulty in locating relevant information in their textbooks to solve the problem. The approach involves treating the bulk charge as equivalent to a point charge at the center of the sphere. This method is essential for determining the electric field in the specified region.
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find the electric field 2.5m from the center of region of space with a charge density given by ro=5.5E-15 R**(2.3)

i flip all over the book, i still can't find anything to solve this question, can anyone help?
the ans from the back of the book is .00241
 
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AFAIR, it might be supposed that bulk charge within sphere is equal to the point charge
Q=(4/3)*Pi*(R^3)*ro placed into the center of sphere.
 
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