Violent crime in many American schools is an unfortunate fact of life. An analysis of schools and violent crime yielded the table of joint probabilities shown next.

If one school is randomly selected find the following probabilities.
a. Probability of at least one incident of violent crime during the year in a primary school.
b. Probability of no violent crime during theyear.

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Violent Crime Committed This Year No Violent Crime Committed Level Primary Middle High School Combined .393 176 134 074 191 010 007 015