江西财经大学统计学试??有答案解?- 百度文库 ر

pq250800???103.64%k?242000pq?䶯Ӱ죺

?pq??pq?250800?242000?8800(Ԫ)01q0001004֣

pq263700???105.14%k?250800pq?۸䶯Ӱ죺

?pq??pq?263700?250800?12900(Ԫ)11p0111014֣

108.97%=103.64%105.14% 21700=8800+12900 1֣

ֲƷֵܲڱȻ8.97%Զ

21700ԪƷIJƽ3.64%Ӷʹֵܲ8800ԪƷij۸ƽ5.14%Ӷʹֵܲ12900Ԫ 2֣

Ƽ⣨15֣

ƽʹʱx?1057Сʱ/ֻ1֣ ݺϸp?91.5% 1֣ ƽʹʱ׼s??(x?x)2f?53.76Сʱ2֣

n?1?s253.762??3.80Сʱ3n200ʹʱƽ?x?֣

ݵĺϸʳƽ?p?Z?/;2?21֣

?2np(1?p)?n0.915?0.085?1.97%3֣

200

95.45%ʹ䣺1057?7.601049.401064.602֣ ϸ䣺91.5%?3.94%87.56%95.44%2֣ ߡػع⣨15֣

1r=0.75 3֣ 1

֣

2yc=1.26+0.76x 5֣عϵ 3

֣

3Sy0.16 3֣

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3ʹͬ£780Сʱƽλֵƽ׼Ƕ٣ûи֪׼Ĵʱ䣬Բö֪4֣

4ͳѧĽǶԻ´ʱ߸Ӧעġ3֣

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