State exam question on averages (mean), question #2

NGSS Science Videos

This video helps children prepare for state math exams by explaining how to solve a retired (released) question from an actual state exam.    - If you want to copy any of our more than 100 free Google Forms (all with questions and links to free-access educational videos we've made), then please download this free file from TPT and it will give you directions for how to access them: https://www.teacherspayteachers.com/Product/State-Math-Test-questions-and-answers-as-a-Google-Form-2022-Q6-10-V2-11530867   Other free resources we've made:  - For links to many free educational resources, please visit our website (no 3rd party advertising, no subscriptions, no paywalls): https://TestPrepLLC.org/   - For our free apps for Apple's Mac and iPad (collects no data, no advertising, no subscriptions, no paywalls, no in-app purchases), please visit our page on the Apple App Store. These apps include Common Core and State based practice tests in math, and State science exams based on NGSS and State curriculums (all with detailed, colorful explanations): https://apps.apple.com/us/developer/test-prep-llc/id1727786893   Best wishes,  The staff at Test Prep LLC  https://TestPrepLLC.org

Transcript

00:00This video is part of a Google Form quiz that teachers can assign to their students for

00:05homework. After the students submit their answers, then they can play a video like

00:09this one to see the answer explained. We've made more than 100 quizzes as Google Forms

00:15with free access videos, which teachers are welcome to copy for free. To get access to these,

00:21please see the link in the description. This video is based on a question from an

00:26actual state exam. You may have one like this on your state exam. If you've not already watched

00:32the video on how to calculate the average, then we suggest that you view it before watching this

00:37video. The list shows the flight speeds in miles per hour of several birds. What is the mean flight

00:43speed of these birds? We define the mean as the answer to a division problem. In everyday language,

00:50we use the word average instead of the word mean. The word mean is used on math tests and in math

00:56books, but has the same idea and formula as the word average. The mean of a set of numbers equals

01:03the sum of those numbers divided by the number count. There are eight numbers in this list,

01:08so the number count for this set is eight. The sum of these items is the total of 72,

01:14plus 68, plus 95, plus 70, plus 80, plus 62, plus 77, plus 68. That sum equals 592.

01:26Here's the formula for the mean. The mean equals the sum of the numbers divided by the number count.

01:32We substitute the phrase sum of numbers with 592. We substitute the phrase number count with 8.

01:40Then we do the division. 592 divided by 8 equals 74. The mean for this list is 74. The mean flight

01:49speed for these birds is 74 miles per hour. Choice C is correct. Thanks for your attention.

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