Verified Answer :

debambarish2013
  1. Probability of finding defective phone=4/60=1/15
    No. of phones=4200
    No. of phones likely to be defective=4200/15=280

    7. Probability of an elk being infected=8/50=4/25 
    No. of elks=4500
    No. of elks likely to be infected= (44500)/25
                                                     = 4    180
                                                     =720

    Hope it helped:) 

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