100 students take a course pass/fail. if they pass they get 4 points towards their gpa, if they fail they get 0. if 90 students pass, what is the mean and standard deviation (to 1 decimal) of the points earned?

mean:
standard deviation:

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

Big boi and travis scott are performing at the super bowl. travis scott is 62 years younger than twice big boi’s age. the sum of their ages is 70 years old. use b to represent big boi’s age. write and solve an equation.

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x