i have 2 statistic questions please

Mathematics
Tutor: None Selected Time limit: 1 Day

May 20th, 2015

9. z=1.881 =(x-400)100

188.1 +400 =x

x=588

10. P(47<x<54)=P((47-50)/2<z< (54-50)/2)=  P(-1.5< z< 2)= .9772-.0668 =.9104

      P(x<55) =P(z< (55-50)/2)=P(z<2.5)=.9938

May 20th, 2015

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May 20th, 2015
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May 20th, 2015
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