Researchers examined the mechanical properties of webs spun by the orb spider, Nephelia edulis. A table in their published report gives summary statistics for a number of variables in the form of the mean plus or minus the standard error of the mean. This form is very common in scientific publications. For 22 adult female spiders, web areas (in square centimeters, cm) are 628 29. What are x and s for these spider webs? (Enter your answer as a whole number for x and rounded to one decimal place for s.)