The rent in an urban neighborhood is normally distributed. The mean is $650 per month with a standard deviation of $50. Estimate the percent of apartment residents who pay from $600 to $750 per month.

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct