a psychology class consists of 14 males and 36 females

Mathematics
Tutor: None Selected Time limit: 1 Day

if the professor selects names from the class list using random sampling

A.what's the probabilty the first student will be female?

B.if a random sample of n=3 students is selected, the first 2 are female what is rthe probabilty that third will be male

Nov 16th, 2014

P(first female) =36/50 =0.72

P(first two females, third male) =(36/50)*(35/49)*(14/48)= 0.72*0.7143*0.2917=0.15

Here order is important


Nov 16th, 2014

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