On the average, only 1 person in 1000 has a particular rare blood type. a) Find the probability that, in a city of 10,000 people, no one has this blood type. b) How many people would have to be tested to give a probability greater than 1/2 of finding at least one person with this blood type?

Aaron invested a total of $4,100, some in an account earning 8% simple interest, and the rest in an account earning 5% simple interest. how much did he invest in each account if after one year he earned $211 in interest? select one: a. $200 at 8%, $3,900 at 5% b. $3,200 at 8%, $900 at 5% c. $900 at 8%, $3,200 at 5% d. $3,900 at 8%, $200 at 5%