Please help i am failing this class currently!!

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms

Which one ? is the answer and how to find this answer

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab