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Algebra and Functions Videos 140 videos

SAT Math 1.2 Algebra and Functions
359 Views

SAT Math: Algebra and Functions Drill 1, Problem 2. Based on the data in the table, what is the maximum heart rate for the average 22-year-old?

SAT Math 1.3 Algebra and Functions
220 Views

SAT Math 1.3 Algebra and Functions. How many 16 oz. bottles did she buy?

SAT Math 1.4 Algebra and Functions
207 Views

SAT Math 1.4 Algebra and Functions. Solve for x.

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SAT Math 7.1 Algebra and Functions 185 Views


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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.

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