查看完整版本 : 我太耐沒有接觸數學,請教一些M1數學問題

StevenSzeto 2018-12-1 10:07 PM

我太耐沒有接觸數學,請教一些M1數學問題

我太耐沒有接觸數學,請教一些M1數學問題,希望數學大神解答參考下

1.904 candidates’ exam marks X~N(M,s²)M,s=49.23 ,18.55. find to number of passes mark is 35
Refer to above,if 5.44% of candidates ,find the mark needed to get a distinction.

2. 2 biased coins are tossed with pdf
     H     T
coin1 0.5102  0.4898
coin2 0.5526  0.4474
Find P (exactly 1H l at least 1H)Find P (exactly 1T l at least 1T)

uzumymw888 2018-12-4 10:46 PM

P (exactly 1H l at least 1H)= (P(TH)+P(HT))/(P(TH)+P(HT)+P(HH))
=(0.2706+0.228)/(0.2706+0.228+0.282)=0.6387

P (exactly 1T l at least 1T)=(P(TH)+P(HT))/(P(TH)+P(HT)+P(TT))
=(0.2706+0.228)/(0.2706+0.219+0.228)=0.6948

StevenSzeto 2018-12-30 12:05 PM

感謝 之前看youtube 自學 做完了
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