1. Which of following is the valid probability value for the discrete random variable?
a. 0.22
b. 1.01
c. -.75
d. All of the above
e. None of the above
2. The J.O. Supplies Company purchases calculators from the Korean supplier. The probability of the defective calculator is 10%. If 15 calculators are chosen at random, find out the probability that 3 or more of calculators will be defective?