Mathematics (AS & A Level) · Oct / Nov 2019 · Paper 73 · Question 7
9709
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Bob is a self-employed builder. In the past his weekly income had mean $546 and standard deviation $120. Following a change in Bob’s working pattern, his mean weekly income for 40 randomly chosen weeks was $581. You should assume that the standard deviation remains unchanged at $120.
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7(i)[5]
7(ii)[5]
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