The figures below are similar.  Find the length of the side labeled x.  

A group of people are classified according to height and then random samples of people from each group are taken.  This is an example of what type of sampling?

A survey of senior citizens at a doctor’s office shows that 40% take blood pressure lowering medication, 47% take cholesterol lowering medication, and 13% take both types of medication.  What is the probability that a senior citizen chosen at random either takes a blood pressure lowering or a cholesterol lowering medication?

Find the sample standard deviation of the following data set: 13, 8, 8, 18, 18, 6, 11, 10, 18

Determine the probability that a randomly selected student is a freshman and prefers veggie toppings.  Round your answers to three decimal places.

At a lumber company that sold shelves, a customer could choose from 3 types of wood, 5 different widths, and 6 different lengths.  How many different types of shelves could be ordered?

You are dealt two cards successively (without replacement) from a shuffled deck of 52 playing cards.  Find the probability that both cards are black.

Angles 1 and 2 supplementary angles.  What are the measures of the two angles?

A card is drawn from a well shuffled deck of 52 cards.  What is the probability of drawing a face card or a 6? Round your answer to three decimal places.

A petting zoo consists of 3 goats, 2 llamas, a pig, and 9 sheep.  If an animal is randomly selected, what is the probability that the student is not a llama?