ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Playlist Algebra and Functions Test Questions 74 videos
CAHSEE Math Algebra and Functions: Drill Set 1, Problem 1. At this rate, what is the total cost of 10 songs?
CAHSEE Math Algebra and Functions: Drill Set 1, Problem 2. Which of the following represents the statement?
CAHSEE Math: Algebra and Functions: Drill Set 1, Problem 3. What equation fits the description?
SAT Math 7.1 Algebra and Functions 185 Views
Share It!
Description:
SAT Math 7.1 Algebra and Functions
Transcript
- 00:02
Gettin' shmoopy with it...
- 00:05
The arithmetic mean of p numbers is k.
- 00:08
Twice the sum of those numbers is 240. What is p?
- 00:12
And here are the potential answers...
- 00:16
Okay, so we're on the lookout for p...
Full Transcript
- 00:21
We can find averages by taking the sum of numbers and
- 00:24
dividing the sum by the... number of numbers.
- 00:30
In this case, we know that the mean, or k,
- 00:34
equals the sum of the numbers divided by the number of numbers (p).
- 00:39
Since we know that twice the sum is 240, the actual sum is 120.
- 00:45
Our equation becomes k equals 120 over p.
- 00:48
Because we want to find p, not k, we just need to rework the
- 00:52
equation to isolate p from the rest of it.
- 00:55
And we get p equals 120 over k.
- 00:58
The answer is B.
Related Videos
SAT Math 2.1 Geometry and Measurement. What is the measure of angle z in terms of x and y?
In 2014, the unemployment rate of one county in California was 7%. In another county, the unemployment rate was 11%. Which of the following express...
Angela is making cookies for a bake sale. She expects each batch of her cookies to sell for $40. It costs her $10 to make one batch of cookies, and...