Let x denote the number of missing pieces in a randomly selected 500-piece puzzle from a local thrift shop. The variable x has the following probability distribution:
х o 1 2 3 4
P(X) 0.33 0.44 0.2 0.02 0.01
Calculate and interpret ox. (4 points)

Which statements regarding the diagram are true? check all that apply.

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?