Acompany uses a computer program to create coupon codes for customers to use on its website. the codes are made up from the symbols ! , #, & , *, as well as any letter from the alphabet.

the company uses the program to make a code, one character at a time.

what is the probability the first character is a symbol?

answer as a decimal rounded to the nearest hundredth.

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.