Independent and Dependent Probability 2

A marble bag contains 3 red marbles, 4 gray marbles, 6 white marbles, and 5 black marbles. What is the probability of randomly drawing a red marble and then a gray marble if the first marble is replaced?

• $\frac{1}{9}$

• $\frac{1}{27}$

• $\frac{1}{6}$

• $\frac{2}{9}$

There are 4 white marbles, 6 red marbles, and 2 blue marbles. Once a marble is selected, it is not replaced. Find the probability of selecting 2 blue marbles. (blue, then blue without replacement).

• $\frac{1}{2}$

• $\frac{1}{36}$

• $\frac{1}{6}$

• $\frac{1}{66}$

Dependent probability happens when the first item is not replaced, causing the total to decrease by 1.

• true

• false

A pocket contains 3 pennies, 2 nickels, 1 quarter and 4 dimes. What is the probability of randomly choosing a dime, replacing it, and then drawing a penny?

• independent

• dependent

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.7

CCSS.7.SP.C.8

A box contains 9 new light bulbs and 6 used light bulbs. Each light bulb is the same size and shape. Meredith will randomly select 2 light bulbs from the box without replacement. What is the probability Meredith will select a new light bulb and then a used light bulb?

• 1/54

• 2/15

• 6/25

• 9/35

You are playing a game of scrabble. The tiles shown are dropped in a bag. You need to choose two tiles. What is the probability of choosing an "E", keeping it, and then choosing a "H"?

• $\frac{4}{15}$

• $\frac{1}{70}$

• $\frac{1}{75}$

• $\frac{1}{225}$

You are playing a game of scrabble. What is the probability that you choose a "T" from the bag of tiles, keep it. and then select a "C" tile?

• 2/15

• 1/7

• 2/105

• 1/225

A box contains all the letters of the word

U N D E R S T A N D.

What is the probability of selecting an 'N' first and a 'D' next, if the first letter is replaced? (Expressed as a percent)

• 20%

• 4%

• 10%

• 45%

A jar contains 4 white chips, 5 purple chips, and 1 black chip. Chips are selected randomly one at a time, and are not replaced. P(purple then purple)

• $\frac{2}{9}$

• $\frac{2}{5}$

• $\frac{3}{4}$

• $\frac{4}{9}$

Stella has some colored cards that are the same size and shape.

-The probability of randomly selecting a blue card is 30%

-The probability of randomly selecting a red is 40%

What is the probability Stella will randomly select a card that is NOT blue, replace it, then randomly select a card that is red?

• 28%

• 24%

• 30%

• 12%