HW Quiz: Randomness and General Addition Rule in Probability

A box of writing utensils on a teacher's desk contains 8 red pencils, 7 green pencils, 9 red markers, and 5 green markers. What is the probability of selecting a red writing utensil or a marker? Write your answer as a fraction (not simplified).

The French Club at a local college sponsored a social. The event was open to all students at the college. Of the 125 students that attended, 30 were fluent in French and 45 were fluent in Spanish. 18 of the students were fluent in both French and Spanish. If you randomly select a student who attended the social, what is the probability of choosing a student who is fluent in French or Spanish? Write your answer as a fraction.

What is the probability that a randomly selected tree from this experiment lived two or more years or was treated with an antibiotic? Write your answer as a fraction.

In a diet analysis of three different juvenile fish species, a researcher surveyed 6263 fish. The counts of fish are in the table. What is the probability that a randomly selected fish is a coho salmon eating small prey? Write your answer as a fraction.

Match the following probabilities with their corresponding events when rolling a six-sided die.

• Rolling a two

• 1/3

• Rolling an even number

• 1/2

• Rolling a number greater than four

• 1/6

• Rolling a number less than five

• 2/3

Suppose you spin the spinner 1000 times. Approximately how many times would you expect it to land in sector 4?

A standard deck of 52 cards contains four suits: hearts, diamonds, spades, and clubs. Each suit consists of cards numbered 2 through 10, a Jack, a Queen, a King, and an Ace.

If you draw a card from a standard deck of cards, then put the card back in and reshuffle before drawing again, what is the probability of drawing a red card on the second draw? Write your answer as a fraction.

A standard deck of 52 cards contains four suits: hearts, diamonds, spades, and clubs. Each suit consists of cards numbered 2 through 10, a Jack, a Queen, a King, and an Ace.

If you draw a red card (heart or diamond) from a standard deck of cards and then don't replace it (you don't put it back in the deck) before drawing again, what is the probability of drawing a red card on the second draw? Write your answer as a fraction.

Probability is ...

• the chance that some event will occur.
• a game that involves coins.
• a guarantee.

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.6

CCSS.7.SP.C.7

Probability can be written as ...

• a fraction
• a decimal
• a percent
• all of the above