Question

In a discount supermarket, it is found that 70% of the sales are for less than 50$. Find the probability a) Four randomly selected sales are each less than 50$ b) at least one of four randomly selected sales is 50$ or more c) 8 or more of 12 sales are less than 50$ ??

Answer 1

a) .7*.7*.7*.7=24.01%
b) At least one ..100-24.01=75.99%
c) .7^8+.7^9+.7^10+.7^11+.7^12=15.99%

Answer 2

thank you !