Question

Use the following to answer questions #13 - 15 The table shows the results of a survey that asked 2850 people whether they are involved in any type of charity work. A person is selected at random from the sample Frequently 221 Occasionally 456 430 Not at all 795 Male Total 1472 1378 2850 Total 428 1536 13. The probability the person is frequently or occasionally involved in charity work is: a) 0.0466 ) 0.4611 C) 0.1607 d) 0.4165 423 +0 6 2850 14. The probability the person is male given that the person is frequently involved in charity work is: a) 0.4836 b) 0.1501 c) 0.5164 d) 0.5165 2 2) 428. 15. The probability the person is female and frequently involved in charity work is: a) 0.0466 b) 0.0726) c) 0.4836 d) 0.5165 207 72 2850 16. A 6-sided die is rolled 10 times and the random variable X represents the number of times a 2 comes up. What is the probability a 2 comes up on exactly 3 out of the 10 rolls? a) 0.0013 b) 0.0046 c) 0.1550 d) 0.9303 1 5 0203 6 17. The random variable representing the number of students taking this exam is: a) discrete b) continuous 18. The random variable representing the length of time students use the computer each week is: a) discrete b) continuous 19. Assume the random variable x is normally distributed with a mean of 86 and standard deviation of 5,then P(70 < x <80) = a) 0.0517 b) 0.1144 c) 0.8856 d) 0.9483 20. Write the following probabilities in order from least likely to occur to most likely to occur: 1/3,.288, 61%, 1 a) 1, 61%, 1/3,.288 b) 288, 1/3,61%, 1 c) 1/3, 288, 61%, 1 d) 1/3, 288, 1,61%