Figure abcd is graphed on a coordinate plane.

abcd is an isosceles trapezoid. what is the approximate perimeter of abcd? round to the nearest tenth.

16.5 units
18.9 units
20.9 units
24.0 units

Given a normal distribution with µ =50 and σ =4, what is the probability that 5% of the values are less than what x values? between what two x values (symmetrically distributed around the mean) are 95 % of the values? instructions: show all your work as to how you have reached your answer. don’t simply state the results. show graphs where necessary.