A traveling salesman makes five visits in one day At each vi

A traveling salesman makes five visits in one day. At each visit the salesman has a 25% chance of making a sale. Let Z= # of sales made on this day. You must show work and not use binocdf or binopdf

mean is 5×.25=1.25
standard deviation is sqrt(5×.25×.75)=.96825

Q: Using the distribution, what is the probability that the number of sales will be within 2 standard deviations of the mean?