1. What is the probability of the youngest four members of a 15-member choir being randomly selected for a group of four singers?
(They can be chosen in any order.)

a) 1
—-
8190

b) 4
—-
32760

C) 4
—-
15

D) 1
——
1365

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.