IXL | Make predictions | 8th grade math

Abby's Bagel Shop recorded how many bagels it recently sold in each flavor.

onion bagels	1
plain bagels	5
blueberry bagels	1
whole wheat bagels	13

Considering this data, how many of the next 16 bagels sold should you expect to be plain bagels?

plain bagels

ref_doc_title.

Learn with an example

question

Pam surveyed 18 students at her school about their favorite classes. Of the students surveyed, 6 said their favorite class was English. If Pam surveys 12 more students, how many of them should she expect to pick English, based on past data?

students

key idea

The experimental probability is the number of times an event occurs out of the total number of trials.

solution

First, write the experimental probability as a fraction in simplest form.

(

English

)

English

total

The experimental probability is

We can predict the outcome of the second set of trials by assuming that the ratio will be the same as in the first set of trials. Write a proportion by setting the two ratios equal to each other, then solve.

(

)

Multiply both sides by

(

)

(

)

Multiply both sides by

(

)

Simplify

Divide both sides by 3

If Pam surveys 12 more students, she should expect 4 of them to pick English.

Looking for more? Try these:

Lesson: Probability

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Teacher tools

Work it out

Not feeling ready yet? These can help:

JJ.1Probability of simple events

JJ.3Experimental probability

Lesson: Probability

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