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Markscheme answer is 21/271 = 0.077 and 40/271 = 0.148, but I get 21/236 = 0.089 and 40/236 = 0.170. Am I being stupid or is the markscheme wrong?

 May 17, 2018
 #1
avatar+101768 
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I do not understand this question Will. Is some of the explanation missing?

 May 18, 2018
 #3
avatar+28022 
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Add up all the numbers to get 236.  In row a1, column b2 is 21, so Probability is 21/236.

Alan  May 18, 2018
 #2
avatar+28022 
+1

I get the same as you Will.  Looks like whoever did the marking scheme added an extra 35 into the total!

 May 18, 2018

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