418: Prevalence of a disease is:

 a) Rate
 b) Ratio
 c) Proportion
 d) Deviation

 Ans: C[Ref.Soben peter 3rd ed pg 87]


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417: A series may have all except:

 a) No mode
 b) One mode
 c) Many mode
 d) Nagative mode


 Ans:D[Ref.Tyagi Ist ed pg 56]

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416: In a random sampling chance of being piced up is

 a) Same and known
 b) Not same and not known
 c) Not same but known
 d) Same and not known

 Ans:D[Ref.Soben peter 3er ed pg 24,25]


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