This is my problem and solution, please assist as my instructor says it is incorrect. Research on ne

This is my problem and solution, please assist as my instructor says it is incorrect.
Research on new juvenile delinquents revealed that 38% of them committed another crime.
(a)What is the probability that of the last 100 new juvenile delinquents put on probation, 30 or more will commit another crime?
(b)What is the probability that 40 or fewer of the delinquents will commit another crime?
(c)What is the probability that between 30 and 40 of the delinquents will commit another crime?
This is my workings which I got incorrect
4.μ = n π = 100(0.38)
= 38
σ² = 100(0.38) (0.62)
σ² = 23.56
σ = √23.56
σ = 4.85

 

Looking for a Similar Assignment? Let us take care of your classwork while you enjoy your free time! All papers are written from scratch and are 100% Original. Try us today!