41 lines
375 B
Plaintext
41 lines
375 B
Plaintext
ans
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031158
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$\dfrac{16}{3}$, $\dfrac{16}{9}$
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031159
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$\dfrac{3}{8}$
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031196
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$6.7$
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031160
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B
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031162
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B
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031163
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B
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031164
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C
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031202
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D
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031201
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C
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031203
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C
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031161
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(1) $77.5\%$; (2) $69.1\%$
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031179
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(1) $r\approx 0.925$; (2) $y=0.13 x+350.5$; (3) 约$754$
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031188
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$\chi^2\approx 285.96$, 按$95\%$的可靠性要求, 对$11$岁儿童可以作出花粉热与湿疹有关的结论 |