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Instructions: Choose the letter that corresponds to the correct answer. Use an 1. Which of the following is the formula of mean of probability answer sheet for your answers. distribution? 1. Which of the following is a correct meaning of the symbol >"? A. H = Ex + P(X C. H = EP(X) / EX B. u = P(X) - EX D. H = EX.P(X) A. divided by C. sum of B. product of D. subtracted from 2. The symbol "u" stands for A. mean c. mode 2. The symbol "o"" stands for B. median D. variance A. mean C. mode B. mediar D. variance For numbers 3 - 5, refer to the probability distribution shown below. For numbers 3 - 5, refer to the probability distribution table below. X P(X) 0.2 0.6 P(X) 3. What is the missing probability that corresponds if x = 3? A. 0.4 C. 0.2 3. What is the missing probability that corresponds if x = 5? 3. 0.3 D. 0.1 A. 0.6 C. 0.2 B. 0.3 D. 0.1 . Calculate the mean of probability distribution. A. 1 C. 3 4. Calculate the mean of probability distribution. 2 2 D. 4 A. 2 C. 6 B. 4 5. Find the variance of the probability distribution. A. 1.6 C. 3.6 5. Find the variance of the probability distribution. B. 2.6 D. 4.6 A. 1.2 C. 1.6 B. 1.4 D. 1.8 For number 6-10, In rolling a die we need to find out the average number of spots that would appear before you answer the number 6 to 10. For number 6-10, In rolling a die we need to find out the average number of spots that would appear before you answer the number 6 to 10. 6. What are the numbers of random variable? A. 0,1,2,3,4,5 C. 0, -1, -2, -3, -4, -5 5. What are the numbers of random variable? 3. 1,2,3,4,5,6 D. -1, -2, -3, -4, -5, -6 A. 0, 1, 2, 3, 4, 5 C. 0, -1, -2, -3, -4, -5 B. 1, 2, 3, 4, 5, 6 D. -1, -2, -3, -4, -5, -6 7. The probability of the 3 spots of a die is 7. The probability of the 5 spots of a die is C. A. B. D. = B. - D. - 8. What is the sum of all P(X)? A. - 1 C. 1 3. -6 D. 6 8. What is the sum of all P(X)? A. -1 C. 1 B. - 6 D. 6 9. Which of the following statements is true? . Which of the following statements is not true? the sum of all probabilities is - 1 A. the sum of all probabilities is 1. X is stand for random variable. B. X stands for random variable. C. mean of probability distribution is 3.6 C. mean of probability distribution is 3.9 . formula for variance of probability distribution is u = EX-P(X). D. formula for mean of probability distribution is u = EX-P(X). 10. The mean of probability distribution is 10. The mean of probability distribution is A. 3.4 C. 3.8 1. 3.4 C. 3.8 B. 3.5 D. 3.9 B. 3.5 D. 3.9 For numbers 11-15, refer to the word problem below. For number 11-15, refer to the word problem below. The number of cars sold per day at a local car store, along with its The number of cars sold per day at a local car store, along with its corresponding probabilities is shown in the succeeding table. corresponding probabilities is shown in the succeeding table. Number of Number of cars 0 sold X 0 2 4 cars sold X 2 P(X) P(X) To 3 2 2 To To 11. What are the numbers of random variable? 1 1. What are the numbers of random variable? A. 1, 2, 3, 4 ,5 C. 0, -1, -2. -3. -4 A. 1, 2, 3, 4, 5 C. 0, -1, -2.-3.-4 B. -1, -2, -3, -4, -5 D. 0, 1, 2, 3, 4 B. -1, -2, -3, -4, -5 D. 0, 1, 2, 3, 4 12. The probability of 1 car is 12. The probability of 3 cars is A . B. 10 C. TO B. TO D. O 13. What is the sum of all P(X)? 13. What is the sum of all P(X)? A. 1 A. 1 B. 2 4 B. D. 4 14. Which of the following statements is not true? 14. Which of the following statements is true? A. The sum of all probabilities is 1. A. x stands for probability. B. formula for variance of probability distribution is u = EX.P(X). B. sum of all probabilities is -1. C. X stands for random variable. C. mean of probability distribution is 2.2. D. mean of probability distribution is 2.2 D. formula for variance of probability distribution is u - EX-P(X). 15. The variance of the probability distribution is_ 15. The variance of the probability distribution is. A. 1.56 C. 3.56 A. 1.53 C. 1.55 B. 2.56 D. 4.56 B. 1.54 D. 1.56 act 1 act 2