a box contains ten ticket, four marked with a positive number and six with a negative number. all the numbers are between -10 and 10. one thousand draws will be made at random with replacement from the box. you are asked to estimate the chance that the sum will be positive.
a) can you do it on the basis of the information already given?
b) can you do it if you are also told the average and SD of the numbers in the box, but are not told the numbers themselves?