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# Reading pictographs

Common sense tells you that a pictograph must be some kind of....picture. Yes! A pictograph is basically a way to represent data with pictures that relate to the data. Let's look at this word problem that asks to interpret a pictograph. Created by Sal Khan and Monterey Institute for Technology and Education.

Video transcript

According to the pictograph below, how many survey respondents have type O positive blood ? How many have O negative blood ? So pictograph is really just a way of representing data with pictures that are somehow related to the data So in this case they give us little pictures of am assuming blood drops right over here And they tell us each blood drop each blood drop in this pictograph represents 8 people so you can kinda view that as the scale of these graphs Each of this is 8 people So, For Example You say how many people have A positive would be 1, 2, 3, 4, 5 , 6 , 7 blood drops but each of those blood drops represent 8 people, so it would be 56 people have type A positive But, lets answer the actual question that they are asking us How many survey respondents have type O positive O Positive So this is O and then we care about O positive So we have, 1 blood drop, 2, 3 Let me just do this in a new different color. We have 1, 2, 3, 4, 5, 6, 7, 8 So we have 8 drops I'll put those in quotes cause of the pictures of drops and then the scale is,the scale is 8 people. 8 people Let me write it this way Times 8 people per drop 8 people per drop and so, 8 times and 8 and actually the drops you can view them as cancelling out if you view them as units so drops, drops 8 times 8 is equal to 64 64 people So they could have literally written the number 64 right over here 64 People have type O positive blood So now lets think about the O negative case O negative blood Well this is O and then within the blood group O This is O negative and we have 1 drop, 2 drops So we have 2 drops Two Drops Times 8 people per drop 8 people per drop so 2 times 8. each of these represent 8 So 8 and then 16 Or, 2 times 8 is equal to 16, 16 people so 16 of the survey respondents 16 have type O negative and 64 have type O positive