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According to the pictograph below, how many survey respondents

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have type O positive blood ? How many have O negative blood ?

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So pictograph is really just a way of representing data with pictures that are

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somehow related to the data

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So in this case they give us little pictures of am assuming blood drops

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right over here

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And they tell us

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each blood drop

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each blood drop in this pictograph represents 8 people

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so you can kinda view that as the scale of these graphs

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Each of this is 8 people

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So, For Example

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You say how many people have A positive would be

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1, 2, 3, 4, 5 , 6 , 7 blood drops

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but each of those blood drops represent 8 people, so it would be 56

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people have type A positive

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But, lets answer the actual question that they are asking us

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How many survey respondents have type O positive

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O Positive

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So this is O and then we care about O positive

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So we have, 1 blood drop, 2, 3

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Let me just do this in a new different color.

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We have 1, 2, 3, 4, 5, 6, 7, 8

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So we have 8 drops

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I'll put those in quotes cause of the pictures of drops

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and then the scale is,the scale is 8 people. 8 people

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Let me write it this way

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Times 8 people per drop

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8 people per drop

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and so, 8 times and 8 and actually the drops you can view them as cancelling out

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if you view them as units

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so drops, drops

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8 times 8 is equal to 64

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64 people

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So they could have literally written the number 64 right over here

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64 People have type O positive blood

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So now lets think about the O negative case

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O negative blood

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Well this is O and then within the blood group O

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This is O negative

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and we have 1 drop, 2 drops

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So we have 2 drops

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Two Drops

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Times 8 people per drop

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8 people per drop

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so 2 times 8.

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each of these represent 8

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So 8 and then 16

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Or, 2 times 8 is equal to 16, 16 people

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so 16 of the survey respondents

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16 have type O negative and 64 have type O positive