9 1/4- 2 5/8 in simpilest form

Aphrase is shown read the phrase and give me the answer

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?

D. in a discrete probability distribution, the sum of the probabilities for the discrete variables will be > 1. true or false