Answer the following MCQs: I need help with some MCQs

4. The length of time that an auditor spends reviewing an invoice is approximately normally distributed with a mean of 600 seconds and a standard deviation of 100 seconds. What is the probability that an auditor will spend more than 12 minutes on an invoice? h a) 0.53. c b) 0.12. i\" c) 0.16. 'N d) 0.99. 5. Here are the counts of the number of students who graduated from a local college, classied by the faculty and the gender of the graduate. IArts Science Education Engineering Male less 356 I44 27 Female 31 235 |44 29 What is the probability that a randomly chosen student who graduated from Engineering is male? i\" a) 0.50. F b) 0.58. i\" c) 0.56. A d) 0.48. 6. The expected return to the casino for every dollar bet in roulette is about $.05. The expected return to the casino for every dollar bet on a slot machine is about $.30. What is the expected total return if $50,000 is bet on roulette and $80,000 is bet on the slols in an evening? i\" a) $65,000. A b) $2500. 5 c) $24,000. F' d) $26,500. 7. The following is a probability distribution for the time spent (minutes) by an auditor in reviewing invoices of about $10,000: [Time Spent 1 3 5 10 Probability 0.2 0.3 0.3 .7 The standard deviation of the time spent by an auditor to review one invoice is: i\" a) 9.24 minutes. (1 b) 3.64 minutes. A c) 1.91 minutes. '\\ d) 3.04 minutes