From past records, the owner of a hotdog cart knows that his daily sales follow a left-skewed distribution with mean $ 275 and standard deviation $72 . What is the probability that the average sales for a random sample of six days is between $260 and $280 ? a. impossible to determine with the information given O b. 0.2625 O C. 0.5675 O d. 0.2496 O e. 0.3050