At a certain prison it was found that 71 of the inmates had had a ...

[joesmith1212]

At a certain prison it was found that 71 of the inmates had had a first arrest at the age of 15 or younger. It was also found that 70 of the population were identified as having had a drug problem.
 
  What is the probability of selecting at random an inmate who had been arrested at 15 or younger and had also been identified as having a drug problem?
  a. .14
   b. .50
  c .95
   d. .46

Question 2

 is an efficient way to write
 
  a. add up values.
  b. the mean.
  c. the number of values in a data set.
  d. a numerator.

[mochi09]

Answer to Question 1

b

Answer to Question 2

a