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Missing value given the mean

AP.STATS:
UNC‑1 (EU)
,
UNC‑1.I (LO)
,
UNC‑1.I.2 (EK)
CCSS.Math:
Learn how to find the value of a missing piece of data if you know the mean of the data set.

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• what can i do to remember what mode means
• Mo de = Mo st occurring number.
Me a n = A verage
M ed i an = Mi ddle
• Is there a simpler way to figure out this question?
• Think the mean as the zero point,then the data would be transform to [+1,-2,<unknown>-4,-2,+0,+4], when you sum them up excluding <unknown>, it results +1,it means you have to fill a number -1 to balance the data,or you can say <unk>-4=-1,where <unk> is equal to 3
• And is there a simpler way to do this
thx and I would really appreciate it
• When asked to stop and think about the missing number, my first thought was to multiply the mean by the number of kids/data points - 4 x 6 giving me 24. Then I subtracted all the known ages... 24-8-4-2-2-5 giving me 3 (the same answer).
This seemed easier than the method in the video, but would this method always work for me?
• Yes, it will work, because it is basically the exact same thing that Sal did in the video. The only difference is that Sal added the known ages together before subtracting them from the total.
24 − 8 − 4 − 2 − 2 − 5 = 24 − (8 + 4 + 2 + 2 + 5)
• What does Sal mean when he cancels out the 6?
(1 vote)
• All that really means is that 6/6 =1, and anything multiplied by 1 is itself.
• How are ways for us to remember what does mode mean?
• Hey diddle diddle,
the median's the middle;
you add and divide for the mean.
The mode is the one that appears the most,
and the range is the difference between.
• so its like finding mean?
• Quick re-cap(tell me if I am wrong)
Mean: Add all the digits(in the right place value) and divide it by how many numbers there are.
Median: The middle amount/ the average.
Mode: Most common number..
• Yes, you got it right (don't forget to order the numbers from least to greatest first for the median).
• Wait so finding a missing value given the mean is just a complex algebraic equation?
• Yes, but it isn't too complex. For example, we have data set 20, 13, 16, 17, 25, and x with a mean of 19. Here are the steps for finding x:

1) (20 + 13 + 16 + 17 + 25 + x) / 6 = 19
6 is the amount of numbers in the data set including x

2) (91 + x) / 6 = 19
Add all of the values possible to simplify

3) 91 + x = 19(6)
Multiply both sides by 6

4) x = 114 - 91
Subtract 91 from both sides

5) x = 23

Hope this helps!😀
• How can I use a weighted average of an incomplete set of numbers to determine the total number of offices for 10 multinational companies?

Here's my problem.
There are 10 multinational companies with large, medium, and small branches worldwide.
I have the number of offices for the large, medium, and small branches of 6 of the 10 multinational companies.
I also have the average number of offices for each of the large, medium, and small branches of the 6 multinational companies.
I do not have the number of offices for the large, medium, and small branches of the other 4 multinational companies.

I calculated the weighted average number of offices for all the large, medium, and small branches of the 6 multinational companies.

How can I use this weighted average to calculate the total number of offices for all 10 multinational companies?
Is there any way to solve the problem