Which is not an example of a discrete random variable? 1.number ...

[olgavictoria]

Which is not an example of a discrete random variable?
  1.number of books in a backpack
  2.number of students in a classroom
  3.number of miles driven to your home from school
  4.number of bottles of water in your refrigerator

Question 2

A gasoline tank for a certain car is designed to hold 19 gallons of gas. Suppose that the random variable x = actual capacity of a randomly selected tank has a distribution that is well approximated by a normal curve with mean 19.0 gallons and standard deviation 0.2 gallon. What is the probability that a randomly selected tank will hold at least 18.9 gallons?
   
  1.0.19
  2.0.69
  3.1
  4.0.31
  5.0.81

[ririgirl15]

Answer to Question 1

3

Answer to Question 2

2