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Bar graphs

# Reading bar graphs: dog bones

Sal reads and interprets bar graphs.

## Want to join the conversation?

• why do we write zero down in our graphs if its nothing? If we want to know how many apples we have and we have nun than theirs no need to write zero down.
• You write ZERO to show that you know that are ZERO (0) apples. If you write nothing we won't know that you know.
Absence of answer is not always zero. Absence of answer (not writing) may mean that you don't know the answer.
When you write down 0 we'll know that you have the right answer for this question.

Let's have an example:
Let's plot a graph of Nobel prizes won by countries.
How many Nobel Prizes where won by Egyptians ?
If you leave it blank on the graph we'll assume that you DON'T know how many. Actually it's a "right" answer .. you honestly don't know. Absence of information.
If you write down 0 (zero) we'll think that you think Egyptians never won any Nobel Prize and it's wrong since 4 Egyptians have won the Nobel prize.
So, 0 is different from nothing,
• IN khan will we eaver have to create bar grapghs
?\
• actually, yes we will. In different skills you will need to know this stuff.
• what kinds of uses could we make of a bar graph or graph besides the ones in this video
• All kinds of things. Really you could make a graph out of anything.
• How can we use bar graphs and charts to make equations?
• Each bar on a graph can represent a number in an addition problem. The sum of the bars is equal to the total amount.
• what do i do when i need help?? i can't unerderstand the qouitons? thank you
• When you can't understand the questions, try to find a video relating to your problem. Or, you can ask a question here and the community can help you out!
• Is there different ways to make a bar graph?
• Bar graphs can be vertical or horizontal, but I think other forms have different names. For example, picture graphs are similar to bar graphs, but they aren't classified as bar graphs.
• how to read bar graph when it is given inin the middle of any two numbers?
• In such cases you must take the average of the two numbers , that means if you have two numbers like 6 and 8 then you must add 6 and 8 then divide the sum by the number of terms you are adding which in this case is 2 , and hence we get the answer 7