So, we have the interval 0.38 < p < 0.54:
Assume that p is in the middle of the given interval:
p = (0.54-0.38) / 2 = 0.08
Then, e can be calculated as follows:
e = end of interval - p = 0.54 - 0.08 = 0.46
The required expression can be written as follows:
p ± e = 0.08 ± 0.46
