Question 1169956
z=(0.37-0.30)/sqrt(0.3*0.7/86)
=0.07/0.0494=1.4166
z=(0.49-0.30)/0.0494=3.8462
probability z is between those two values is 0.0782

note, rounding to four decimal places in the above assumes the proportion given will be an integer. It is not, so that the proportion used is a rounding, and four decimal places is not going to be accurate even though it may be calculated.