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Urgent help - maths statistics

I keep getting this question wrong and I don't know where I'm going wrong. Please helpImageUploadedByStudent Room1383399423.917929.jpg

It's question 3. The answer says that it is 81.9 but I keep getting 80-80.5 depending on my rounding


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Reply 1
First: 0.34x70 = 23.8
(20.8/24 x100) +1000 = 1086.666... =1086.7
Second: 0.66x70 = 46.2
(19.2/28 x 100) +1100 = 1168.57... = 1168.6

1168.6-1086.7 = 81.9
Reply 2
Oh my goodness, I had it written down as 71. Thanks so much! hahaha
Reply 3
No worries

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