What is the value of -3 2/3 +1/3

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

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!