Probability Study Guide 2020

Which value indicates the greatest likelihood of an event occurring?

• $\frac{1}{2}$

• 0.34

• $\frac{5}{8}$

• 0.48

Ms. Thompson tossed a fair coin 6 times and got heads every time. Theoretically, what will happen on the next toss of this coin?

• She will definitely toss tails.

• She will definitely toss heads.

• She is neither likely nor unlikely to toss a head.

• She is more likely to toss heads than tails.

Each of the six faces of a certain cube is labeled either X or Y. When the cube is tossed, the probability of the cube landing with side X face up is ⅔ . How many faces are labeled X?

• 2 Faces

• 3 Faces

• 4 Faces

• 6 Faces

An experimental probability may not match its theoretical probability. Which number of trials will most likely give an experimental probability that will most closely match the theoretical probability of the event?

• 1 event

• 5 events

• 15 events

• 25 events

If West Hall Middle School wants to know the experimental probability that the next two students enrolled will be boys, which simulation tool would be most appropriate to use?

• rolling a five sided dice twice

• spinning a spinner with 3 equal sections twice

• picking two marbles from a bag of seven different colored marbles

• flipping a coin twice

Suppose each of the following is the result of tossing a coin, heads (H) or tails (T). Which result has an experimental probability, P(heads) = 60%?

• HHTTH

• THHTT

• THTTT

• HTHHH

Mr. Adamson will toss a fair coin 3 times. The possible results are illustrated in the tree diagram below. Based on the information given in the tree diagram, what is the probability that Adamson will toss two or more tails?

• $\frac{5}{8}$

• $\frac{1}{8}$

• $\frac{1}{2}$

• $\frac{1}{4}$

Ms. Phillips rolls a number cube with faces numbered 1 to 6 is rolled 24 times. In theory, how many times would she expect to roll a number greater than 4?

• 10

• 8

• 20

• 12

A jar M&M’s contains the following pieces: 8 red, 10 blue, 12 yellow, and 10 green. A M&M is drawn at random. Find the P (not yellow).

• $\frac{1}{2}$

• $\frac{7}{10}$

• $\frac{3}{4}$

• $\frac{3}{10}$

Mrs. Key rolls two fair number cubes. Using the number sum chart, find the probability that he will roll values on the number cubes that have a sum of four. Write the answer in simplest form.

• 0

• $\frac{1}{6}$

• $\frac{2}{3}$

•  $\frac{1}{12}$