Rcct answer from each drop-down menu.
7.8
The data represented by the graph is normally distributed and adheres to the 68-95-99.7 rule. The standard deviation of this data is
% of the data is either less than 4.2 or more than 11.4.

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

I'm confused on this could anyone me and show me what i need to do to solve it.

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?