ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


Algebra and Functions Videos 52 videos

SAT Math 7.3 Algebra and Functions
318 Views

SAT Math 7.3 Algebra and Functions

GED Math 5.3 Rational Numbers
203 Views

GED Math 5.3 Rational Numbers. What operation would make the following expression undefined?

PSAT 1.10 Math Diagnostic
256 Views

PSAT 1.10 Math Diagnostic. Which of the following is a factor of the expression?

See All

SAT Math 7.1 Algebra and Functions 185 Views


Share It!


Description:

SAT Math 7.1 Algebra and Functions

Language:
English Language

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...

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
2779 Views

SAT Math 2.1 Geometry and Measurement. What is the measure of angle z in terms of x and y?

SAT Math 9.4 Algebra and Functions
1300 Views

SAT Math 9.4 Algebra and Functions

SAT Math 9.2 Algebra and Functions
377 Views

SAT Math 9.2 Algebra and Functions

SAT Math: Identifying an Equation for the Average of Two Percentages
23 Views

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...

SAT Math: Which Equation Represents Profit?
13 Views

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...