Lindsay infers that out of 400 people, 300 would prefer to watch movies in a theater. Is her inference valid? Explain. Theater: 30
Streaming: 62
DVD: 8
( this information was given in a table but I couldn't do that here)

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

Which shows how to solve the equation 3/4x=6 for x in one step?