ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Algebra and Functions Videos 140 videos
SAT Math 2.3 Algebra and Functions. Calculate this function.
SAT Math 7.1 Algebra and Functions 185 Views
Share It!
Description:
SAT Math 7.1 Algebra and Functions
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...