I'm having issues finding the answers to these 3 questions.

Approximate the mean for the following data set. Round your answer to one decimal place. Class Frequency 0-12 13-25 12 26-38 8 39-51 12 52-64 11 Send data to Excel The mean is approximatelyDon't drink and drive: A highway safety council reported that there were 3906 fatalities among drivers in auto accidents in a particular year. Following is a frequency distribution of their ages. Approximate the mean age. Round your answer to one decimal place. Age Number of Fatalities 11-20 353 2130 1530 3140' 823 4150' 681 5160 414 6170 100 i: Send data to Excel::l The mean is approximately I]. Time to review: The following table presents the time taken to review articles that were submitted for publication to a particular journal during a recent year. A few articles took longer than 6 months to review; these are omitted from the table. Consider the data to be a population. Time (Months) Number of Articles 00.9 42 1.0- 1.9 19 2.02.9 16 3.03.9 20 4.04.9 11 5.0-5.9 15 :3: Send data to Excel)! (a) Approximate the variance of the times. Round the answer to at least two decimal places. The variance is D. (b) Approximate the standard deviation of the times. Round the answer to at least two decimal places. The standard deviation is D