JETJET1581IN JETJET1581IN 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