Grade 8 · Math

8th grade All the outcomes of a repeated experiment, and the chance of a compound event worksheet

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All the outcomes of a repeated experiment, and the chance of a compound event

Grade 8 Math Worksheet

NameDate

Circle the best answer, or write your answer on the line.

Ari flips a fair coin 5 times in a row. How many outcomes are in the whole list?
Esme rolls a fair number cube 3 times. How many outcomes are in the whole list?
Jun flips a fair coin 4 times. What is the chance of exactly 2 tails, as a fraction in simplest form?
Luz spins a spinner with 3 equal parts (red, blue, yellow) 2 times. What is the chance both spins land on the same color, in simplest form?
Milo rolls a fair number cube 2 times. What is the chance both rolls are greater than 4, as a fraction in simplest form?
Noah flips a fair coin 3 times. What is the chance of heads all 3 times, as a decimal?
Pia's spinner has 5 equal parts, and 1 of them is a star. Pia spins it 2 times. What is the chance of a star both times, as a percent?
Ren's bag has 2 green and 3 white marbles. Ren draws one without looking. It is put back, and Ren draws again. What is the chance both are green, as a percent?
Zee rolls a fair number cube twice, and does this 180 times. About how many times will both rolls be a 1 or a 2?
Ari's spinner has 5 equal parts, and 2 are red. Ari spins twice, and does this 250 times. About how many times will both spins be red?

8th grade All the outcomes of a repeated experiment, and the chance of a compound event worksheet – printable — Print: 1 2 3 4 5 6

About this worksheet

All the outcomes of a repeated experiment, and the chance of a compound event. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

I can count every outcome of an experiment repeated two to five times by multiplying.
I can find the chance of an event across the repeats as a fraction, decimal or percent.
I can find "at least one" as 1 minus none, and predict about how many times an event happens.

Builds on the grade 7 standard 7.SP.C.8a–b

Words to know

repeated experiment: The same flip, spin, roll or draw done again and again.

outcome list: Every possible result in order, one row each.

compound event: An event that needs more than one step, like two heads.

at least one: One or more; everything except none.

put back: The thing drawn goes back in, so the bag is the same again.

Common mistakes

Your child added the choices for each step instead of multiplying. Each outcome of one step splits into all the outcomes of the next.

Your child counted only one step of the repeated experiment. List every step: two flips of a coin have 4 outcomes, not 2.

Your child added the chances of the steps. Adding gives either-or; for both to happen, use the whole outcome list (the chance gets smaller).

Questions parents ask

What is the most common mistake with all the outcomes of a repeated experiment, and the chance of a compound event?

Your child added the choices for each step instead of multiplying. Each outcome of one step splits into all the outcomes of the next.

Are these 8th grade math worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

More grade 8 math

See all grade 8 math

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