Use the Following to Answer Questions

Short Answer

Use the following to answer questions :
In a recent Gallup poll,52% of parents with children under 18 years of age gave themselves a grade of B for the job they are doing bringing up their kids.Assume that this percentage is true for the current population of all parents with children under 18 years of age.You take a random sample of 1044 such parents and ask them to give themselves a grade for the job they are doing bringing up their kids.
-The probability that 520 to 555 will give themselves a grade of B is approximately: (Round the answer to 4 decimal places.)