It is known that 81% of all new products introduced in grocery stores fail (are taken off the market) within 2 years. If a grocery store chain introduces 61 new products, find the following probabilities. (Round your answers to four decimal places.)
a) within 2 years 47 or more fail
b) within 2 years 58 or fewer fail
c) within 2 years 15 or more succeed
d) within 2 years fewer than 10 succeed