JETJET1581GO JETJET1581GO Math Answered 48. What is the variance? A. 30.85 B. 39.71 C. 41.25 D. 43.4 49. What is the mean of the grouped data? A. 97 B. 128 C. 134 D. 154 50. Which of the following is the standard deviation? A. 4.67 B. 5.78 C. 6.30 D. 7.25