What is the difference between discrete graphs and continuous graphs? I am so confused. Thank you for any help.

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?