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solve histogram

 Sep 12, 2018
 #1
avatar+100587 
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We can do this by working out the areas of the rectangles  = base * height

Rectangle   6 -10 .....base  = 4  and height  = 3....area  =  12

Rectangle 10-12  ....base  = 2  and height  = 8....area  =  16

Rectangle 12 - 14  ....base  = 2    and height  = 11.....area  = 22

Rectangle 14 -15......base  = 1 and height = 23...area  = 23

Rectangle 15 - 16 .....base  = 1  and height  = 19  ....area  = 19

Rectangle 16 - 20...base  = 4  and height  = 2....area  = 8

 

Number  of mice  below 10g  =

 

[ Area  of rectangle 6-10] / [ Area of all rectangles]  * 1000  =

 

[ 8 ] / [ 12 + 16 + 22 + 23 + 19 + 8 ]  * 1000  =

 

[ 8 ]  / [100] * 1000   =     8000 / 100  =    80  mice

 

 

 

cool cool cool

 Sep 12, 2018

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