An industrial psychologist administered a personality test for passive-aggressive traits to 150 employees. Each individual received a score from 1 to 5, where 1 was extremely passive and 5 extremely aggressive. of 3 does not indicate or feature. The results are shown in the table. (Hint: Calculate probability as relative frequency) (use 2 decimal places) Score (x) 1 2 3 4 5 Frequency 24 33 42 30 21

a. What is the probability that his score is at least 3? = Answer

b. What is the expected value of the probability distribution? = Answer

c. What is the standard deviation of the probability distribution? = Answer