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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?

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

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?

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?

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

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?

You are dealt two cards successively (with replacement) from a standard 52 card deck.  Find the probability of getting a face card (King, Queen, or Jack) and an Ace.