The upper number is NUMERATOR and below one is DENOMINATOR
Since x is basically any number, there are many solutions when you replace x. such as 1,3,4 etc. and it will always be true.
You will get better grades
Here, p^ = (0.39 + 0.47)/2 = 0.43
The given interval is (0.43 - 0.04, 0.43 + 0.04).
Therefore, the margin of error is 0.04.
The answer is 3.40 since you rounded to the hundredths place and not the tenths.