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Not sure how to finish off this question,the frequency adds up to 1 but isn't right and neither is the 2nd part of the question

 Nov 6, 2018
 #1
avatar+4424 
+1

I assume you were given the numbers in white.

 

I don't see any errors in (a)

 

she should expect (100+250)(0.2) = 70 balls.

 Nov 6, 2018

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