An additional 2000 runners entered the race but did not complete it. Of these runners, a mail questionnaire was sent to a random sample of 600 and completed by 500. One of the items in this questionnaire asked the respondent to estimate the average number of miles run weekly during the 8 weeks preceding the marathon. The mean x of the number of miles run was 32.4 with standard deviation sx equal to 7.3. A simple random sample of 500 of the 10,000 runners completing the marathon yielded 400 respondents who averaged 46.8 miles weekly with standard deviation equal to 6.2 miles. What is the estimated weekly miles run in that period among all those who entered the marathon?